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Finding the Fourth Proportional to 778.42, 1,072.29 and 581.59

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Solution

The fourth proportional to 778.42, 1,072.29 and 581.59 is: 801.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.42 : 1,072.29 = 581.59 : x
  2. Step 2: Convert to fraction form
    778.42/1,072.29 = 581.59/x
  3. Step 3: Cross multiply
    778.42x = 1,072.29 × 581.59
  4. Step 4: Simplify right side
    778.42x = 623,633.14
  5. Step 5: Solve for x
    x = 623,633.14/778.42
  6. Step 6: Final answer
    x = 801.15

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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.