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Finding the Fourth Proportional to 885.88, 1,221.65 and 553.88

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Solution

The fourth proportional to 885.88, 1,221.65 and 553.88 is: 763.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.88 : 1,221.65 = 553.88 : x
  2. Step 2: Convert to fraction form
    885.88/1,221.65 = 553.88/x
  3. Step 3: Cross multiply
    885.88x = 1,221.65 × 553.88
  4. Step 4: Simplify right side
    885.88x = 676,651.94
  5. Step 5: Solve for x
    x = 676,651.94/885.88
  6. Step 6: Final answer
    x = 763.82

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1.5x scale

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.