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Finding the Fourth Proportional to 978.44, 1,350.14 and 558.79

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Solution

The fourth proportional to 978.44, 1,350.14 and 558.79 is: 771.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.44 : 1,350.14 = 558.79 : x
  2. Step 2: Convert to fraction form
    978.44/1,350.14 = 558.79/x
  3. Step 3: Cross multiply
    978.44x = 1,350.14 × 558.79
  4. Step 4: Simplify right side
    978.44x = 754,444.73
  5. Step 5: Solve for x
    x = 754,444.73/978.44
  6. Step 6: Final answer
    x = 771.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.