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Finding the Fourth Proportional to 137,006.40, 205,720.80 and 74,798.40

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Solution

The fourth proportional to 137,006.40, 205,720.80 and 74,798.40 is: 112,312.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,006.40 : 205,720.80 = 74,798.40 : x
  2. Step 2: Convert to fraction form
    137,006.40/205,720.80 = 74,798.40/x
  3. Step 3: Cross multiply
    137,006.40x = 205,720.80 × 74,798.40
  4. Step 4: Simplify right side
    137,006.40x = 15,387,586,686.72
  5. Step 5: Solve for x
    x = 15,387,586,686.72/137,006.40
  6. Step 6: Final answer
    x = 112,312.90

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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.