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Finding the Fourth Proportional to 457.69, 686.65 and 133.07

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Solution

The fourth proportional to 457.69, 686.65 and 133.07 is: 199.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.69 : 686.65 = 133.07 : x
  2. Step 2: Convert to fraction form
    457.69/686.65 = 133.07/x
  3. Step 3: Cross multiply
    457.69x = 686.65 × 133.07
  4. Step 4: Simplify right side
    457.69x = 91,369.25
  5. Step 5: Solve for x
    x = 91,369.25/457.69
  6. Step 6: Final answer
    x = 199.63

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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.