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Finding the Fourth Proportional to 457.81, 630.18 and 399.49

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Solution

The fourth proportional to 457.81, 630.18 and 399.49 is: 549.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.81 : 630.18 = 399.49 : x
  2. Step 2: Convert to fraction form
    457.81/630.18 = 399.49/x
  3. Step 3: Cross multiply
    457.81x = 630.18 × 399.49
  4. Step 4: Simplify right side
    457.81x = 251,750.61
  5. Step 5: Solve for x
    x = 251,750.61/457.81
  6. Step 6: Final answer
    x = 549.90

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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.