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Finding the Fourth Proportional to 661,151, 912,388.38 and 392,879

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Solution

The fourth proportional to 661,151, 912,388.38 and 392,879 is: 542,173.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,151 : 912,388.38 = 392,879 : x
  2. Step 2: Convert to fraction form
    661,151/912,388.38 = 392,879/x
  3. Step 3: Cross multiply
    661,151x = 912,388.38 × 392,879
  4. Step 4: Simplify right side
    661,151x = 358,458,234,346.02
  5. Step 5: Solve for x
    x = 358,458,234,346.02/661,151
  6. Step 6: Final answer
    x = 542,173.02

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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.