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Finding the Fourth Proportional to 457.70, 630.30 and 408.02

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Solution

The fourth proportional to 457.70, 630.30 and 408.02 is: 561.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.70 : 630.30 = 408.02 : x
  2. Step 2: Convert to fraction form
    457.70/630.30 = 408.02/x
  3. Step 3: Cross multiply
    457.70x = 630.30 × 408.02
  4. Step 4: Simplify right side
    457.70x = 257,175.01
  5. Step 5: Solve for x
    x = 257,175.01/457.70
  6. Step 6: Final answer
    x = 561.89

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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.