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Finding the Fourth Proportional to 766.78, 1,061.04 and 701.20

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Solution

The fourth proportional to 766.78, 1,061.04 and 701.20 is: 970.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.78 : 1,061.04 = 701.20 : x
  2. Step 2: Convert to fraction form
    766.78/1,061.04 = 701.20/x
  3. Step 3: Cross multiply
    766.78x = 1,061.04 × 701.20
  4. Step 4: Simplify right side
    766.78x = 744,001.25
  5. Step 5: Solve for x
    x = 744,001.25/766.78
  6. Step 6: Final answer
    x = 970.29

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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.