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Finding the Fourth Proportional to 457.16, 686.32 and 421.36

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Solution

The fourth proportional to 457.16, 686.32 and 421.36 is: 632.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.16 : 686.32 = 421.36 : x
  2. Step 2: Convert to fraction form
    457.16/686.32 = 421.36/x
  3. Step 3: Cross multiply
    457.16x = 686.32 × 421.36
  4. Step 4: Simplify right side
    457.16x = 289,187.80
  5. Step 5: Solve for x
    x = 289,187.80/457.16
  6. Step 6: Final answer
    x = 632.57

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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.