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Finding the Fourth Proportional to 676,589.76, 933,691.86 and 390,107.34

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Solution

The fourth proportional to 676,589.76, 933,691.86 and 390,107.34 is: 538,346.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    676,589.76 : 933,691.86 = 390,107.34 : x
  2. Step 2: Convert to fraction form
    676,589.76/933,691.86 = 390,107.34/x
  3. Step 3: Cross multiply
    676,589.76x = 933,691.86 × 390,107.34
  4. Step 4: Simplify right side
    676,589.76x = 364,240,047,884.25
  5. Step 5: Solve for x
    x = 364,240,047,884.25/676,589.76
  6. Step 6: Final answer
    x = 538,346.97

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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.