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Finding the Fourth Proportional to 885.57, 1,221.71 and 512.28

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Solution

The fourth proportional to 885.57, 1,221.71 and 512.28 is: 706.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.57 : 1,221.71 = 512.28 : x
  2. Step 2: Convert to fraction form
    885.57/1,221.71 = 512.28/x
  3. Step 3: Cross multiply
    885.57x = 1,221.71 × 512.28
  4. Step 4: Simplify right side
    885.57x = 625,857.60
  5. Step 5: Solve for x
    x = 625,857.60/885.57
  6. Step 6: Final answer
    x = 706.73

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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.