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Finding the Fourth Proportional to 390.97, 586.61 and 147.47

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Solution

The fourth proportional to 390.97, 586.61 and 147.47 is: 221.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.97 : 586.61 = 147.47 : x
  2. Step 2: Convert to fraction form
    390.97/586.61 = 147.47/x
  3. Step 3: Cross multiply
    390.97x = 586.61 × 147.47
  4. Step 4: Simplify right side
    390.97x = 86,504.26
  5. Step 5: Solve for x
    x = 86,504.26/390.97
  6. Step 6: Final answer
    x = 221.25

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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.