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Finding the Fourth Proportional to 813.72, 1,121.84 and 673.32

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Solution

The fourth proportional to 813.72, 1,121.84 and 673.32 is: 928.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.72 : 1,121.84 = 673.32 : x
  2. Step 2: Convert to fraction form
    813.72/1,121.84 = 673.32/x
  3. Step 3: Cross multiply
    813.72x = 1,121.84 × 673.32
  4. Step 4: Simplify right side
    813.72x = 755,357.31
  5. Step 5: Solve for x
    x = 755,357.31/813.72
  6. Step 6: Final answer
    x = 928.28

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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.