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Finding the Fourth Proportional to 81,785.40, 122,678.10 and 71,417.40

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Solution

The fourth proportional to 81,785.40, 122,678.10 and 71,417.40 is: 107,126.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,785.40 : 122,678.10 = 71,417.40 : x
  2. Step 2: Convert to fraction form
    81,785.40/122,678.10 = 71,417.40/x
  3. Step 3: Cross multiply
    81,785.40x = 122,678.10 × 71,417.40
  4. Step 4: Simplify right side
    81,785.40x = 8,761,350,938.94
  5. Step 5: Solve for x
    x = 8,761,350,938.94/81,785.40
  6. Step 6: Final answer
    x = 107,126.10

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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.