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Finding the Fourth Proportional to 125,588.80, 188,091.60 and 85,931.20

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Solution

The fourth proportional to 125,588.80, 188,091.60 and 85,931.20 is: 128,697.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,588.80 : 188,091.60 = 85,931.20 : x
  2. Step 2: Convert to fraction form
    125,588.80/188,091.60 = 85,931.20/x
  3. Step 3: Cross multiply
    125,588.80x = 188,091.60 × 85,931.20
  4. Step 4: Simplify right side
    125,588.80x = 16,162,936,897.92
  5. Step 5: Solve for x
    x = 16,162,936,897.92/125,588.80
  6. Step 6: Final answer
    x = 128,697.28

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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.