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Finding the Fourth Proportional to 125,072, 187,539.40 and 85,639.04

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Solution

The fourth proportional to 125,072, 187,539.40 and 85,639.04 is: 128,411.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,072 : 187,539.40 = 85,639.04 : x
  2. Step 2: Convert to fraction form
    125,072/187,539.40 = 85,639.04/x
  3. Step 3: Cross multiply
    125,072x = 187,539.40 × 85,639.04
  4. Step 4: Simplify right side
    125,072x = 16,060,694,178.18
  5. Step 5: Solve for x
    x = 16,060,694,178.18/125,072
  6. Step 6: Final answer
    x = 128,411.59

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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.