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Finding the Fourth Proportional to 390,066.30, 585,101.68 and 120,190.91

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Solution

The fourth proportional to 390,066.30, 585,101.68 and 120,190.91 is: 180,287.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,066.30 : 585,101.68 = 120,190.91 : x
  2. Step 2: Convert to fraction form
    390,066.30/585,101.68 = 120,190.91/x
  3. Step 3: Cross multiply
    390,066.30x = 585,101.68 × 120,190.91
  4. Step 4: Simplify right side
    390,066.30x = 70,323,900,135.74
  5. Step 5: Solve for x
    x = 70,323,900,135.74/390,066.30
  6. Step 6: Final answer
    x = 180,287.04

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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.