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Finding the Fourth Proportional to 642,518, 886,694.32 and 356,011.28

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Solution

The fourth proportional to 642,518, 886,694.32 and 356,011.28 is: 491,306.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,518 : 886,694.32 = 356,011.28 : x
  2. Step 2: Convert to fraction form
    642,518/886,694.32 = 356,011.28/x
  3. Step 3: Cross multiply
    642,518x = 886,694.32 × 356,011.28
  4. Step 4: Simplify right side
    642,518x = 315,673,179,831.93
  5. Step 5: Solve for x
    x = 315,673,179,831.93/642,518
  6. Step 6: Final answer
    x = 491,306.36

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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.