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Finding the Fourth Proportional to 437.90, 656.66 and 129.68

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Solution

The fourth proportional to 437.90, 656.66 and 129.68 is: 194.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    437.90 : 656.66 = 129.68 : x
  2. Step 2: Convert to fraction form
    437.90/656.66 = 129.68/x
  3. Step 3: Cross multiply
    437.90x = 656.66 × 129.68
  4. Step 4: Simplify right side
    437.90x = 85,155.67
  5. Step 5: Solve for x
    x = 85,155.67/437.90
  6. Step 6: Final answer
    x = 194.46

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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.