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Finding the Fourth Proportional to 390.89, 586.46 and 147.44

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Solution

The fourth proportional to 390.89, 586.46 and 147.44 is: 221.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.89 : 586.46 = 147.44 : x
  2. Step 2: Convert to fraction form
    390.89/586.46 = 147.44/x
  3. Step 3: Cross multiply
    390.89x = 586.46 × 147.44
  4. Step 4: Simplify right side
    390.89x = 86,466.93
  5. Step 5: Solve for x
    x = 86,466.93/390.89
  6. Step 6: Final answer
    x = 221.21

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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.