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Finding the Fourth Proportional to 843.90, 1,261.69 and 715.34

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Solution

The fourth proportional to 843.90, 1,261.69 and 715.34 is: 1,069.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.90 : 1,261.69 = 715.34 : x
  2. Step 2: Convert to fraction form
    843.90/1,261.69 = 715.34/x
  3. Step 3: Cross multiply
    843.90x = 1,261.69 × 715.34
  4. Step 4: Simplify right side
    843.90x = 902,531.59
  5. Step 5: Solve for x
    x = 902,531.59/843.90
  6. Step 6: Final answer
    x = 1,069.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.