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Finding the Fourth Proportional to 125,035.60, 187,639.80 and 90,005.20

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Solution

The fourth proportional to 125,035.60, 187,639.80 and 90,005.20 is: 135,069.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,035.60 : 187,639.80 = 90,005.20 : x
  2. Step 2: Convert to fraction form
    125,035.60/187,639.80 = 90,005.20/x
  3. Step 3: Cross multiply
    125,035.60x = 187,639.80 × 90,005.20
  4. Step 4: Simplify right side
    125,035.60x = 16,888,557,726.96
  5. Step 5: Solve for x
    x = 16,888,557,726.96/125,035.60
  6. Step 6: Final answer
    x = 135,069.99

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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.