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Finding the Fourth Proportional to 978.96, 1,350.84 and 559.41

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Solution

The fourth proportional to 978.96, 1,350.84 and 559.41 is: 771.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.96 : 1,350.84 = 559.41 : x
  2. Step 2: Convert to fraction form
    978.96/1,350.84 = 559.41/x
  3. Step 3: Cross multiply
    978.96x = 1,350.84 × 559.41
  4. Step 4: Simplify right side
    978.96x = 755,673.40
  5. Step 5: Solve for x
    x = 755,673.40/978.96
  6. Step 6: Final answer
    x = 771.91

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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.