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Finding the Fourth Proportional to 983.81, 1,475.98 and 398.45

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Solution

The fourth proportional to 983.81, 1,475.98 and 398.45 is: 597.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.81 : 1,475.98 = 398.45 : x
  2. Step 2: Convert to fraction form
    983.81/1,475.98 = 398.45/x
  3. Step 3: Cross multiply
    983.81x = 1,475.98 × 398.45
  4. Step 4: Simplify right side
    983.81x = 588,096.85
  5. Step 5: Solve for x
    x = 588,096.85/983.81
  6. Step 6: Final answer
    x = 597.78

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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.