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Finding the Fourth Proportional to 885.18, 1,221.48 and 492.15

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Solution

The fourth proportional to 885.18, 1,221.48 and 492.15 is: 679.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.18 : 1,221.48 = 492.15 : x
  2. Step 2: Convert to fraction form
    885.18/1,221.48 = 492.15/x
  3. Step 3: Cross multiply
    885.18x = 1,221.48 × 492.15
  4. Step 4: Simplify right side
    885.18x = 601,151.38
  5. Step 5: Solve for x
    x = 601,151.38/885.18
  6. Step 6: Final answer
    x = 679.13

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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.