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Finding the Fourth Proportional to 128,213.64, 176,934.87 and 71,625

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Solution

The fourth proportional to 128,213.64, 176,934.87 and 71,625 is: 98,842.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,213.64 : 176,934.87 = 71,625 : x
  2. Step 2: Convert to fraction form
    128,213.64/176,934.87 = 71,625/x
  3. Step 3: Cross multiply
    128,213.64x = 176,934.87 × 71,625
  4. Step 4: Simplify right side
    128,213.64x = 12,672,960,063.75
  5. Step 5: Solve for x
    x = 12,672,960,063.75/128,213.64
  6. Step 6: Final answer
    x = 98,842.53

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.