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Finding the Fourth Proportional to 7,659.40, 11,489.10 and 5,715.40

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Solution

The fourth proportional to 7,659.40, 11,489.10 and 5,715.40 is: 8,573.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,659.40 : 11,489.10 = 5,715.40 : x
  2. Step 2: Convert to fraction form
    7,659.40/11,489.10 = 5,715.40/x
  3. Step 3: Cross multiply
    7,659.40x = 11,489.10 × 5,715.40
  4. Step 4: Simplify right side
    7,659.40x = 65,664,802.14
  5. Step 5: Solve for x
    x = 65,664,802.14/7,659.40
  6. Step 6: Final answer
    x = 8,573.10

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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.