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Finding the Fourth Proportional to 390.72, 586.14 and 147.30

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Solution

The fourth proportional to 390.72, 586.14 and 147.30 is: 220.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.72 : 586.14 = 147.30 : x
  2. Step 2: Convert to fraction form
    390.72/586.14 = 147.30/x
  3. Step 3: Cross multiply
    390.72x = 586.14 × 147.30
  4. Step 4: Simplify right side
    390.72x = 86,338.42
  5. Step 5: Solve for x
    x = 86,338.42/390.72
  6. Step 6: Final answer
    x = 220.97

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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.