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Finding the Fourth Proportional to 431.89, 647.75 and 123.66

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Solution

The fourth proportional to 431.89, 647.75 and 123.66 is: 185.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.89 : 647.75 = 123.66 : x
  2. Step 2: Convert to fraction form
    431.89/647.75 = 123.66/x
  3. Step 3: Cross multiply
    431.89x = 647.75 × 123.66
  4. Step 4: Simplify right side
    431.89x = 80,100.77
  5. Step 5: Solve for x
    x = 80,100.77/431.89
  6. Step 6: Final answer
    x = 185.47

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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.