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Finding the Fourth Proportional to 457.38, 689.50 and 438.86

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Solution

The fourth proportional to 457.38, 689.50 and 438.86 is: 661.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.38 : 689.50 = 438.86 : x
  2. Step 2: Convert to fraction form
    457.38/689.50 = 438.86/x
  3. Step 3: Cross multiply
    457.38x = 689.50 × 438.86
  4. Step 4: Simplify right side
    457.38x = 302,593.97
  5. Step 5: Solve for x
    x = 302,593.97/457.38
  6. Step 6: Final answer
    x = 661.58

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.