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Finding the Fourth Proportional to 431.90, 647.65 and 123.68

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Solution

The fourth proportional to 431.90, 647.65 and 123.68 is: 185.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.90 : 647.65 = 123.68 : x
  2. Step 2: Convert to fraction form
    431.90/647.65 = 123.68/x
  3. Step 3: Cross multiply
    431.90x = 647.65 × 123.68
  4. Step 4: Simplify right side
    431.90x = 80,099.96
  5. Step 5: Solve for x
    x = 80,099.96/431.90
  6. Step 6: Final answer
    x = 185.46

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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.