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Finding the Fourth Proportional to 885.52, 1,221.72 and 553.84

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Solution

The fourth proportional to 885.52, 1,221.72 and 553.84 is: 764.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.52 : 1,221.72 = 553.84 : x
  2. Step 2: Convert to fraction form
    885.52/1,221.72 = 553.84/x
  3. Step 3: Cross multiply
    885.52x = 1,221.72 × 553.84
  4. Step 4: Simplify right side
    885.52x = 676,637.40
  5. Step 5: Solve for x
    x = 676,637.40/885.52
  6. Step 6: Final answer
    x = 764.11

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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.