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Finding the Fourth Proportional to 128,257.86, 176,995.17 and 71,668.74

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Solution

The fourth proportional to 128,257.86, 176,995.17 and 71,668.74 is: 98,902.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,257.86 : 176,995.17 = 71,668.74 : x
  2. Step 2: Convert to fraction form
    128,257.86/176,995.17 = 71,668.74/x
  3. Step 3: Cross multiply
    128,257.86x = 176,995.17 × 71,668.74
  4. Step 4: Simplify right side
    128,257.86x = 12,685,020,819.99
  5. Step 5: Solve for x
    x = 12,685,020,819.99/128,257.86
  6. Step 6: Final answer
    x = 98,902.48

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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.