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Finding the Fourth Proportional to 983.10, 1,475.28 and 520.68

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Solution

The fourth proportional to 983.10, 1,475.28 and 520.68 is: 781.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.10 : 1,475.28 = 520.68 : x
  2. Step 2: Convert to fraction form
    983.10/1,475.28 = 520.68/x
  3. Step 3: Cross multiply
    983.10x = 1,475.28 × 520.68
  4. Step 4: Simplify right side
    983.10x = 768,148.79
  5. Step 5: Solve for x
    x = 768,148.79/983.10
  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.