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Finding the Fourth Proportional to 457.78, 687.02 and 169.30

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Solution

The fourth proportional to 457.78, 687.02 and 169.30 is: 254.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.78 : 687.02 = 169.30 : x
  2. Step 2: Convert to fraction form
    457.78/687.02 = 169.30/x
  3. Step 3: Cross multiply
    457.78x = 687.02 × 169.30
  4. Step 4: Simplify right side
    457.78x = 116,312.49
  5. Step 5: Solve for x
    x = 116,312.49/457.78
  6. Step 6: Final answer
    x = 254.08

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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.