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Finding the Fourth Proportional to 887.61, 1,329.75 and 521.31

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Solution

The fourth proportional to 887.61, 1,329.75 and 521.31 is: 780.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.61 : 1,329.75 = 521.31 : x
  2. Step 2: Convert to fraction form
    887.61/1,329.75 = 521.31/x
  3. Step 3: Cross multiply
    887.61x = 1,329.75 × 521.31
  4. Step 4: Simplify right side
    887.61x = 693,211.97
  5. Step 5: Solve for x
    x = 693,211.97/887.61
  6. Step 6: Final answer
    x = 780.99

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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.