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Finding the Fourth Proportional to 385.62, 531.90 and 253.05

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Solution

The fourth proportional to 385.62, 531.90 and 253.05 is: 349.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.62 : 531.90 = 253.05 : x
  2. Step 2: Convert to fraction form
    385.62/531.90 = 253.05/x
  3. Step 3: Cross multiply
    385.62x = 531.90 × 253.05
  4. Step 4: Simplify right side
    385.62x = 134,597.30
  5. Step 5: Solve for x
    x = 134,597.30/385.62
  6. Step 6: Final answer
    x = 349.04

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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.