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Finding the Fourth Proportional to 813.76, 1,122.72 and 648.38

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Solution

The fourth proportional to 813.76, 1,122.72 and 648.38 is: 894.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.76 : 1,122.72 = 648.38 : x
  2. Step 2: Convert to fraction form
    813.76/1,122.72 = 648.38/x
  3. Step 3: Cross multiply
    813.76x = 1,122.72 × 648.38
  4. Step 4: Simplify right side
    813.76x = 727,949.19
  5. Step 5: Solve for x
    x = 727,949.19/813.76
  6. Step 6: Final answer
    x = 894.55

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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.