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Finding the Fourth Proportional to 10,439.40, 15,659.10 and 9,953.40

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Solution

The fourth proportional to 10,439.40, 15,659.10 and 9,953.40 is: 14,930.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,439.40 : 15,659.10 = 9,953.40 : x
  2. Step 2: Convert to fraction form
    10,439.40/15,659.10 = 9,953.40/x
  3. Step 3: Cross multiply
    10,439.40x = 15,659.10 × 9,953.40
  4. Step 4: Simplify right side
    10,439.40x = 155,861,285.94
  5. Step 5: Solve for x
    x = 155,861,285.94/10,439.40
  6. Step 6: Final answer
    x = 14,930.10

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.