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Finding the Fourth Proportional to 887.28, 1,330.88 and 521.76

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Solution

The fourth proportional to 887.28, 1,330.88 and 521.76 is: 782.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.28 : 1,330.88 = 521.76 : x
  2. Step 2: Convert to fraction form
    887.28/1,330.88 = 521.76/x
  3. Step 3: Cross multiply
    887.28x = 1,330.88 × 521.76
  4. Step 4: Simplify right side
    887.28x = 694,399.95
  5. Step 5: Solve for x
    x = 694,399.95/887.28
  6. Step 6: Final answer
    x = 782.62

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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.