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Finding the Fourth Proportional to 887.18, 1,221.35 and 665.76

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Solution

The fourth proportional to 887.18, 1,221.35 and 665.76 is: 916.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.18 : 1,221.35 = 665.76 : x
  2. Step 2: Convert to fraction form
    887.18/1,221.35 = 665.76/x
  3. Step 3: Cross multiply
    887.18x = 1,221.35 × 665.76
  4. Step 4: Simplify right side
    887.18x = 813,125.98
  5. Step 5: Solve for x
    x = 813,125.98/887.18
  6. Step 6: Final answer
    x = 916.53

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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.