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Finding the Fourth Proportional to 790.87, 1,091.91 and 542.11

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Solution

The fourth proportional to 790.87, 1,091.91 and 542.11 is: 748.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.87 : 1,091.91 = 542.11 : x
  2. Step 2: Convert to fraction form
    790.87/1,091.91 = 542.11/x
  3. Step 3: Cross multiply
    790.87x = 1,091.91 × 542.11
  4. Step 4: Simplify right side
    790.87x = 591,935.33
  5. Step 5: Solve for x
    x = 591,935.33/790.87
  6. Step 6: Final answer
    x = 748.46

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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.