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Finding the Fourth Proportional to 8,472.30, 11,685.32 and 7,422.54

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Solution

The fourth proportional to 8,472.30, 11,685.32 and 7,422.54 is: 10,237.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,472.30 : 11,685.32 = 7,422.54 : x
  2. Step 2: Convert to fraction form
    8,472.30/11,685.32 = 7,422.54/x
  3. Step 3: Cross multiply
    8,472.30x = 11,685.32 × 7,422.54
  4. Step 4: Simplify right side
    8,472.30x = 86,734,755.11
  5. Step 5: Solve for x
    x = 86,734,755.11/8,472.30
  6. Step 6: Final answer
    x = 10,237.45

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.