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Finding the Fourth Proportional to 781.17, 1,172.48 and 489.26

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Solution

The fourth proportional to 781.17, 1,172.48 and 489.26 is: 734.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.17 : 1,172.48 = 489.26 : x
  2. Step 2: Convert to fraction form
    781.17/1,172.48 = 489.26/x
  3. Step 3: Cross multiply
    781.17x = 1,172.48 × 489.26
  4. Step 4: Simplify right side
    781.17x = 573,642.54
  5. Step 5: Solve for x
    x = 573,642.54/781.17
  6. Step 6: Final answer
    x = 734.34

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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.