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Finding the Fourth Proportional to 983.78, 1,474.62 and 521.27

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Solution

The fourth proportional to 983.78, 1,474.62 and 521.27 is: 781.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.78 : 1,474.62 = 521.27 : x
  2. Step 2: Convert to fraction form
    983.78/1,474.62 = 521.27/x
  3. Step 3: Cross multiply
    983.78x = 1,474.62 × 521.27
  4. Step 4: Simplify right side
    983.78x = 768,675.17
  5. Step 5: Solve for x
    x = 768,675.17/983.78
  6. Step 6: Final answer
    x = 781.35

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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.