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Finding the Fourth Proportional to 9,947.70, 14,921.55 and 9,890.10

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Solution

The fourth proportional to 9,947.70, 14,921.55 and 9,890.10 is: 14,835.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,947.70 : 14,921.55 = 9,890.10 : x
  2. Step 2: Convert to fraction form
    9,947.70/14,921.55 = 9,890.10/x
  3. Step 3: Cross multiply
    9,947.70x = 14,921.55 × 9,890.10
  4. Step 4: Simplify right side
    9,947.70x = 147,575,621.66
  5. Step 5: Solve for x
    x = 147,575,621.66/9,947.70
  6. Step 6: Final answer
    x = 14,835.15

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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.