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Finding the Fourth Proportional to 885.48, 1,221.87 and 512.38

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Solution

The fourth proportional to 885.48, 1,221.87 and 512.38 is: 707.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.48 : 1,221.87 = 512.38 : x
  2. Step 2: Convert to fraction form
    885.48/1,221.87 = 512.38/x
  3. Step 3: Cross multiply
    885.48x = 1,221.87 × 512.38
  4. Step 4: Simplify right side
    885.48x = 626,061.75
  5. Step 5: Solve for x
    x = 626,061.75/885.48
  6. Step 6: Final answer
    x = 707.03

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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.