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Finding the Fourth Proportional to 985.39, 1,479 and 498.79

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Solution

The fourth proportional to 985.39, 1,479 and 498.79 is: 748.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.39 : 1,479 = 498.79 : x
  2. Step 2: Convert to fraction form
    985.39/1,479 = 498.79/x
  3. Step 3: Cross multiply
    985.39x = 1,479 × 498.79
  4. Step 4: Simplify right side
    985.39x = 737,710.41
  5. Step 5: Solve for x
    x = 737,710.41/985.39
  6. Step 6: Final answer
    x = 748.65

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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.