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Finding the Fourth Proportional to 872.64, 1,308.96 and 710.64

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Solution

The fourth proportional to 872.64, 1,308.96 and 710.64 is: 1,065.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.64 : 1,308.96 = 710.64 : x
  2. Step 2: Convert to fraction form
    872.64/1,308.96 = 710.64/x
  3. Step 3: Cross multiply
    872.64x = 1,308.96 × 710.64
  4. Step 4: Simplify right side
    872.64x = 930,199.33
  5. Step 5: Solve for x
    x = 930,199.33/872.64
  6. Step 6: Final answer
    x = 1,065.96

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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.