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Finding the Fourth Proportional to 887.91, 1,331.39 and 579.75

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Solution

The fourth proportional to 887.91, 1,331.39 and 579.75 is: 869.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.91 : 1,331.39 = 579.75 : x
  2. Step 2: Convert to fraction form
    887.91/1,331.39 = 579.75/x
  3. Step 3: Cross multiply
    887.91x = 1,331.39 × 579.75
  4. Step 4: Simplify right side
    887.91x = 771,870.45
  5. Step 5: Solve for x
    x = 771,870.45/887.91
  6. Step 6: Final answer
    x = 869.31

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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.