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Finding the Fourth Proportional to 457.12, 630.34 and 420.13

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Solution

The fourth proportional to 457.12, 630.34 and 420.13 is: 579.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.12 : 630.34 = 420.13 : x
  2. Step 2: Convert to fraction form
    457.12/630.34 = 420.13/x
  3. Step 3: Cross multiply
    457.12x = 630.34 × 420.13
  4. Step 4: Simplify right side
    457.12x = 264,824.74
  5. Step 5: Solve for x
    x = 264,824.74/457.12
  6. Step 6: Final answer
    x = 579.33

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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.