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Finding the Fourth Proportional to 128,849.70, 177,806.58 and 71,488.41

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Solution

The fourth proportional to 128,849.70, 177,806.58 and 71,488.41 is: 98,650.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,849.70 : 177,806.58 = 71,488.41 : x
  2. Step 2: Convert to fraction form
    128,849.70/177,806.58 = 71,488.41/x
  3. Step 3: Cross multiply
    128,849.70x = 177,806.58 × 71,488.41
  4. Step 4: Simplify right side
    128,849.70x = 12,711,109,691.74
  5. Step 5: Solve for x
    x = 12,711,109,691.74/128,849.70
  6. Step 6: Final answer
    x = 98,650.67

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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.