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Finding the Fourth Proportional to 318.48, 477.72 and 123.57

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Solution

The fourth proportional to 318.48, 477.72 and 123.57 is: 185.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.48 : 477.72 = 123.57 : x
  2. Step 2: Convert to fraction form
    318.48/477.72 = 123.57/x
  3. Step 3: Cross multiply
    318.48x = 477.72 × 123.57
  4. Step 4: Simplify right side
    318.48x = 59,031.86
  5. Step 5: Solve for x
    x = 59,031.86/318.48
  6. Step 6: Final answer
    x = 185.36

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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.