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Finding the Fourth Proportional to 869.82, 1,200.33 and 659.76

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Solution

The fourth proportional to 869.82, 1,200.33 and 659.76 is: 910.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.82 : 1,200.33 = 659.76 : x
  2. Step 2: Convert to fraction form
    869.82/1,200.33 = 659.76/x
  3. Step 3: Cross multiply
    869.82x = 1,200.33 × 659.76
  4. Step 4: Simplify right side
    869.82x = 791,929.72
  5. Step 5: Solve for x
    x = 791,929.72/869.82
  6. Step 6: Final answer
    x = 910.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.