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Finding the Fourth Proportional to 494.61, 741.86 and 129.40

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Solution

The fourth proportional to 494.61, 741.86 and 129.40 is: 194.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.61 : 741.86 = 129.40 : x
  2. Step 2: Convert to fraction form
    494.61/741.86 = 129.40/x
  3. Step 3: Cross multiply
    494.61x = 741.86 × 129.40
  4. Step 4: Simplify right side
    494.61x = 95,994.67
  5. Step 5: Solve for x
    x = 95,994.67/494.61
  6. Step 6: Final answer
    x = 194.08

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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.