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Finding the Fourth Proportional to 128,151.65, 176,819.36 and 74,404.31

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Solution

The fourth proportional to 128,151.65, 176,819.36 and 74,404.31 is: 102,660.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,151.65 : 176,819.36 = 74,404.31 : x
  2. Step 2: Convert to fraction form
    128,151.65/176,819.36 = 74,404.31/x
  3. Step 3: Cross multiply
    128,151.65x = 176,819.36 × 74,404.31
  4. Step 4: Simplify right side
    128,151.65x = 13,156,121,219.32
  5. Step 5: Solve for x
    x = 13,156,121,219.32/128,151.65
  6. Step 6: Final answer
    x = 102,660.57

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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.