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Finding the Fourth Proportional to 891.36, 1,329.33 and 762.18

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Solution

The fourth proportional to 891.36, 1,329.33 and 762.18 is: 1,136.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.36 : 1,329.33 = 762.18 : x
  2. Step 2: Convert to fraction form
    891.36/1,329.33 = 762.18/x
  3. Step 3: Cross multiply
    891.36x = 1,329.33 × 762.18
  4. Step 4: Simplify right side
    891.36x = 1,013,188.74
  5. Step 5: Solve for x
    x = 1,013,188.74/891.36
  6. Step 6: Final answer
    x = 1,136.68

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.