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Finding the Fourth Proportional to 872.79, 1,308.86 and 688.06

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Solution

The fourth proportional to 872.79, 1,308.86 and 688.06 is: 1,031.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.79 : 1,308.86 = 688.06 : x
  2. Step 2: Convert to fraction form
    872.79/1,308.86 = 688.06/x
  3. Step 3: Cross multiply
    872.79x = 1,308.86 × 688.06
  4. Step 4: Simplify right side
    872.79x = 900,574.21
  5. Step 5: Solve for x
    x = 900,574.21/872.79
  6. Step 6: Final answer
    x = 1,031.83

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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.