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Finding the Fourth Proportional to 399.62, 595.30 and 387.53

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Solution

The fourth proportional to 399.62, 595.30 and 387.53 is: 577.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.62 : 595.30 = 387.53 : x
  2. Step 2: Convert to fraction form
    399.62/595.30 = 387.53/x
  3. Step 3: Cross multiply
    399.62x = 595.30 × 387.53
  4. Step 4: Simplify right side
    399.62x = 230,696.61
  5. Step 5: Solve for x
    x = 230,696.61/399.62
  6. Step 6: Final answer
    x = 577.29

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.