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Finding the Fourth Proportional to 778.46, 1,072.20 and 581.66

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Solution

The fourth proportional to 778.46, 1,072.20 and 581.66 is: 801.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.46 : 1,072.20 = 581.66 : x
  2. Step 2: Convert to fraction form
    778.46/1,072.20 = 581.66/x
  3. Step 3: Cross multiply
    778.46x = 1,072.20 × 581.66
  4. Step 4: Simplify right side
    778.46x = 623,655.85
  5. Step 5: Solve for x
    x = 623,655.85/778.46
  6. Step 6: Final answer
    x = 801.14

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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.