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Finding the Fourth Proportional to 815.92, 1,126.08 and 790.42

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Solution

The fourth proportional to 815.92, 1,126.08 and 790.42 is: 1,090.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.92 : 1,126.08 = 790.42 : x
  2. Step 2: Convert to fraction form
    815.92/1,126.08 = 790.42/x
  3. Step 3: Cross multiply
    815.92x = 1,126.08 × 790.42
  4. Step 4: Simplify right side
    815.92x = 890,076.15
  5. Step 5: Solve for x
    x = 890,076.15/815.92
  6. Step 6: Final answer
    x = 1,090.89

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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.