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Finding the Fourth Proportional to 813.85, 1,123.11 and 440.83

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Solution

The fourth proportional to 813.85, 1,123.11 and 440.83 is: 608.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.85 : 1,123.11 = 440.83 : x
  2. Step 2: Convert to fraction form
    813.85/1,123.11 = 440.83/x
  3. Step 3: Cross multiply
    813.85x = 1,123.11 × 440.83
  4. Step 4: Simplify right side
    813.85x = 495,100.58
  5. Step 5: Solve for x
    x = 495,100.58/813.85
  6. Step 6: Final answer
    x = 608.34

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Half scale
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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.