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Finding the Fourth Proportional to 885.47, 1,221.95 and 531.46

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Solution

The fourth proportional to 885.47, 1,221.95 and 531.46 is: 733.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.47 : 1,221.95 = 531.46 : x
  2. Step 2: Convert to fraction form
    885.47/1,221.95 = 531.46/x
  3. Step 3: Cross multiply
    885.47x = 1,221.95 × 531.46
  4. Step 4: Simplify right side
    885.47x = 649,408.78
  5. Step 5: Solve for x
    x = 649,408.78/885.47
  6. Step 6: Final answer
    x = 733.41

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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.