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Finding the Fourth Proportional to 769.10, 1,061.53 and 489.11

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Solution

The fourth proportional to 769.10, 1,061.53 and 489.11 is: 675.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.10 : 1,061.53 = 489.11 : x
  2. Step 2: Convert to fraction form
    769.10/1,061.53 = 489.11/x
  3. Step 3: Cross multiply
    769.10x = 1,061.53 × 489.11
  4. Step 4: Simplify right side
    769.10x = 519,198.41
  5. Step 5: Solve for x
    x = 519,198.41/769.10
  6. Step 6: Final answer
    x = 675.08

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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.