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Finding the Fourth Proportional to 385.55, 532.28 and 259.70

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Solution

The fourth proportional to 385.55, 532.28 and 259.70 is: 358.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.55 : 532.28 = 259.70 : x
  2. Step 2: Convert to fraction form
    385.55/532.28 = 259.70/x
  3. Step 3: Cross multiply
    385.55x = 532.28 × 259.70
  4. Step 4: Simplify right side
    385.55x = 138,233.15
  5. Step 5: Solve for x
    x = 138,233.15/385.55
  6. Step 6: Final answer
    x = 358.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.