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Finding the Fourth Proportional to 885.40, 1,221.62 and 553.70

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Solution

The fourth proportional to 885.40, 1,221.62 and 553.70 is: 763.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.40 : 1,221.62 = 553.70 : x
  2. Step 2: Convert to fraction form
    885.40/1,221.62 = 553.70/x
  3. Step 3: Cross multiply
    885.40x = 1,221.62 × 553.70
  4. Step 4: Simplify right side
    885.40x = 676,411.28
  5. Step 5: Solve for x
    x = 676,411.28/885.40
  6. Step 6: Final answer
    x = 763.96

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Double scale
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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.