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Finding the Fourth Proportional to 390.38, 585.57 and 147.02

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Solution

The fourth proportional to 390.38, 585.57 and 147.02 is: 220.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.38 : 585.57 = 147.02 : x
  2. Step 2: Convert to fraction form
    390.38/585.57 = 147.02/x
  3. Step 3: Cross multiply
    390.38x = 585.57 × 147.02
  4. Step 4: Simplify right side
    390.38x = 86,087.57
  5. Step 5: Solve for x
    x = 86,087.57/390.38
  6. Step 6: Final answer
    x = 220.53

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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.