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Finding the Fourth Proportional to 815.39, 1,123.34 and 667.16

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Solution

The fourth proportional to 815.39, 1,123.34 and 667.16 is: 919.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.39 : 1,123.34 = 667.16 : x
  2. Step 2: Convert to fraction form
    815.39/1,123.34 = 667.16/x
  3. Step 3: Cross multiply
    815.39x = 1,123.34 × 667.16
  4. Step 4: Simplify right side
    815.39x = 749,451.99
  5. Step 5: Solve for x
    x = 749,451.99/815.39
  6. Step 6: Final answer
    x = 919.13

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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.