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Finding the Fourth Proportional to 172,279.60, 257,909.10 and 128,102.20

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Solution

The fourth proportional to 172,279.60, 257,909.10 and 128,102.20 is: 191,773.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,279.60 : 257,909.10 = 128,102.20 : x
  2. Step 2: Convert to fraction form
    172,279.60/257,909.10 = 128,102.20/x
  3. Step 3: Cross multiply
    172,279.60x = 257,909.10 × 128,102.20
  4. Step 4: Simplify right side
    172,279.60x = 33,038,723,110.02
  5. Step 5: Solve for x
    x = 33,038,723,110.02/172,279.60
  6. Step 6: Final answer
    x = 191,773.86

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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.