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Finding the Fourth Proportional to 885.20, 1,221.56 and 623.76

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Solution

The fourth proportional to 885.20, 1,221.56 and 623.76 is: 860.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.20 : 1,221.56 = 623.76 : x
  2. Step 2: Convert to fraction form
    885.20/1,221.56 = 623.76/x
  3. Step 3: Cross multiply
    885.20x = 1,221.56 × 623.76
  4. Step 4: Simplify right side
    885.20x = 761,957.15
  5. Step 5: Solve for x
    x = 761,957.15/885.20
  6. Step 6: Final answer
    x = 860.78

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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.