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Finding the Fourth Proportional to 457.40, 686.10 and 422.20

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Solution

The fourth proportional to 457.40, 686.10 and 422.20 is: 633.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.40 : 686.10 = 422.20 : x
  2. Step 2: Convert to fraction form
    457.40/686.10 = 422.20/x
  3. Step 3: Cross multiply
    457.40x = 686.10 × 422.20
  4. Step 4: Simplify right side
    457.40x = 289,671.42
  5. Step 5: Solve for x
    x = 289,671.42/457.40
  6. Step 6: Final answer
    x = 633.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.