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Finding the Fourth Proportional to 390.89, 586.29 and 159.55

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Solution

The fourth proportional to 390.89, 586.29 and 159.55 is: 239.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.89 : 586.29 = 159.55 : x
  2. Step 2: Convert to fraction form
    390.89/586.29 = 159.55/x
  3. Step 3: Cross multiply
    390.89x = 586.29 × 159.55
  4. Step 4: Simplify right side
    390.89x = 93,539.64
  5. Step 5: Solve for x
    x = 93,539.64/390.89
  6. Step 6: Final answer
    x = 239.30

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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.