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Finding the Fourth Proportional to 125,904.60, 188,856.90 and 72,687.60

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Solution

The fourth proportional to 125,904.60, 188,856.90 and 72,687.60 is: 109,031.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,904.60 : 188,856.90 = 72,687.60 : x
  2. Step 2: Convert to fraction form
    125,904.60/188,856.90 = 72,687.60/x
  3. Step 3: Cross multiply
    125,904.60x = 188,856.90 × 72,687.60
  4. Step 4: Simplify right side
    125,904.60x = 13,727,554,804.44
  5. Step 5: Solve for x
    x = 13,727,554,804.44/125,904.60
  6. Step 6: Final answer
    x = 109,031.40

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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.