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Finding the Fourth Proportional to 385.85, 532.60 and 307.31

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Solution

The fourth proportional to 385.85, 532.60 and 307.31 is: 424.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.85 : 532.60 = 307.31 : x
  2. Step 2: Convert to fraction form
    385.85/532.60 = 307.31/x
  3. Step 3: Cross multiply
    385.85x = 532.60 × 307.31
  4. Step 4: Simplify right side
    385.85x = 163,669.87
  5. Step 5: Solve for x
    x = 163,669.87/385.85
  6. Step 6: Final answer
    x = 424.18

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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.