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Finding the Fourth Proportional to 719,910.65, 993,470.79 and 393,223.88

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Solution

The fourth proportional to 719,910.65, 993,470.79 and 393,223.88 is: 542,645.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    719,910.65 : 993,470.79 = 393,223.88 : x
  2. Step 2: Convert to fraction form
    719,910.65/993,470.79 = 393,223.88/x
  3. Step 3: Cross multiply
    719,910.65x = 993,470.79 × 393,223.88
  4. Step 4: Simplify right side
    719,910.65x = 390,656,433,743.11
  5. Step 5: Solve for x
    x = 390,656,433,743.11/719,910.65
  6. Step 6: Final answer
    x = 542,645.72

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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.