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Finding the Fourth Proportional to 390,335.67, 585,505.34 and 120,460.49

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Solution

The fourth proportional to 390,335.67, 585,505.34 and 120,460.49 is: 180,691.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,335.67 : 585,505.34 = 120,460.49 : x
  2. Step 2: Convert to fraction form
    390,335.67/585,505.34 = 120,460.49/x
  3. Step 3: Cross multiply
    390,335.67x = 585,505.34 × 120,460.49
  4. Step 4: Simplify right side
    390,335.67x = 70,530,260,154.02
  5. Step 5: Solve for x
    x = 70,530,260,154.02/390,335.67
  6. Step 6: Final answer
    x = 180,691.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.