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Finding the Fourth Proportional to 872.16, 1,308.89 and 525.88

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Solution

The fourth proportional to 872.16, 1,308.89 and 525.88 is: 789.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.16 : 1,308.89 = 525.88 : x
  2. Step 2: Convert to fraction form
    872.16/1,308.89 = 525.88/x
  3. Step 3: Cross multiply
    872.16x = 1,308.89 × 525.88
  4. Step 4: Simplify right side
    872.16x = 688,319.07
  5. Step 5: Solve for x
    x = 688,319.07/872.16
  6. Step 6: Final answer
    x = 789.21

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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.