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Finding the Fourth Proportional to 885.43, 1,221.99 and 512.39

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Solution

The fourth proportional to 885.43, 1,221.99 and 512.39 is: 707.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.43 : 1,221.99 = 512.39 : x
  2. Step 2: Convert to fraction form
    885.43/1,221.99 = 512.39/x
  3. Step 3: Cross multiply
    885.43x = 1,221.99 × 512.39
  4. Step 4: Simplify right side
    885.43x = 626,136.59
  5. Step 5: Solve for x
    x = 626,136.59/885.43
  6. Step 6: Final answer
    x = 707.15

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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.