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Finding the Fourth Proportional to 985.34, 1,478.82 and 498.53

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Solution

The fourth proportional to 985.34, 1,478.82 and 498.53 is: 748.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.34 : 1,478.82 = 498.53 : x
  2. Step 2: Convert to fraction form
    985.34/1,478.82 = 498.53/x
  3. Step 3: Cross multiply
    985.34x = 1,478.82 × 498.53
  4. Step 4: Simplify right side
    985.34x = 737,236.13
  5. Step 5: Solve for x
    x = 737,236.13/985.34
  6. Step 6: Final answer
    x = 748.20

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.