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Finding the Fourth Proportional to 983.40, 1,474.54 and 521.16

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Solution

The fourth proportional to 983.40, 1,474.54 and 521.16 is: 781.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.40 : 1,474.54 = 521.16 : x
  2. Step 2: Convert to fraction form
    983.40/1,474.54 = 521.16/x
  3. Step 3: Cross multiply
    983.40x = 1,474.54 × 521.16
  4. Step 4: Simplify right side
    983.40x = 768,471.27
  5. Step 5: Solve for x
    x = 768,471.27/983.40
  6. Step 6: Final answer
    x = 781.44

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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.