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Finding the Fourth Proportional to 498.60, 747.95 and 279.21

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Solution

The fourth proportional to 498.60, 747.95 and 279.21 is: 418.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.60 : 747.95 = 279.21 : x
  2. Step 2: Convert to fraction form
    498.60/747.95 = 279.21/x
  3. Step 3: Cross multiply
    498.60x = 747.95 × 279.21
  4. Step 4: Simplify right side
    498.60x = 208,833.72
  5. Step 5: Solve for x
    x = 208,833.72/498.60
  6. Step 6: Final answer
    x = 418.84

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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.