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Finding the Fourth Proportional to 102,520.60, 153,780.90 and 85,931.80

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Solution

The fourth proportional to 102,520.60, 153,780.90 and 85,931.80 is: 128,897.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,520.60 : 153,780.90 = 85,931.80 : x
  2. Step 2: Convert to fraction form
    102,520.60/153,780.90 = 85,931.80/x
  3. Step 3: Cross multiply
    102,520.60x = 153,780.90 × 85,931.80
  4. Step 4: Simplify right side
    102,520.60x = 13,214,669,542.62
  5. Step 5: Solve for x
    x = 13,214,669,542.62/102,520.60
  6. Step 6: Final answer
    x = 128,897.70

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1.5x scale

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.