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Finding the Fourth Proportional to 978.56, 1,468.20 and 516.68

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Solution

The fourth proportional to 978.56, 1,468.20 and 516.68 is: 775.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.56 : 1,468.20 = 516.68 : x
  2. Step 2: Convert to fraction form
    978.56/1,468.20 = 516.68/x
  3. Step 3: Cross multiply
    978.56x = 1,468.20 × 516.68
  4. Step 4: Simplify right side
    978.56x = 758,589.58
  5. Step 5: Solve for x
    x = 758,589.58/978.56
  6. Step 6: Final answer
    x = 775.21

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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.