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Finding the Fourth Proportional to 978.89, 1,350.90 and 559.26

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Solution

The fourth proportional to 978.89, 1,350.90 and 559.26 is: 771.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.89 : 1,350.90 = 559.26 : x
  2. Step 2: Convert to fraction form
    978.89/1,350.90 = 559.26/x
  3. Step 3: Cross multiply
    978.89x = 1,350.90 × 559.26
  4. Step 4: Simplify right side
    978.89x = 755,504.33
  5. Step 5: Solve for x
    x = 755,504.33/978.89
  6. Step 6: Final answer
    x = 771.80

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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.