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Finding the Fourth Proportional to 74,471.40, 102,772.80 and 42,638.40

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Solution

The fourth proportional to 74,471.40, 102,772.80 and 42,638.40 is: 58,842.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,471.40 : 102,772.80 = 42,638.40 : x
  2. Step 2: Convert to fraction form
    74,471.40/102,772.80 = 42,638.40/x
  3. Step 3: Cross multiply
    74,471.40x = 102,772.80 × 42,638.40
  4. Step 4: Simplify right side
    74,471.40x = 4,382,067,755.52
  5. Step 5: Solve for x
    x = 4,382,067,755.52/74,471.40
  6. Step 6: Final answer
    x = 58,842.29

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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.