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Finding the Fourth Proportional to 872.56, 1,308.14 and 690.76

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Solution

The fourth proportional to 872.56, 1,308.14 and 690.76 is: 1,035.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.56 : 1,308.14 = 690.76 : x
  2. Step 2: Convert to fraction form
    872.56/1,308.14 = 690.76/x
  3. Step 3: Cross multiply
    872.56x = 1,308.14 × 690.76
  4. Step 4: Simplify right side
    872.56x = 903,610.79
  5. Step 5: Solve for x
    x = 903,610.79/872.56
  6. Step 6: Final answer
    x = 1,035.59

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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.