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Finding the Fourth Proportional to 769.12, 1,062.55 and 621.50

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Solution

The fourth proportional to 769.12, 1,062.55 and 621.50 is: 858.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.12 : 1,062.55 = 621.50 : x
  2. Step 2: Convert to fraction form
    769.12/1,062.55 = 621.50/x
  3. Step 3: Cross multiply
    769.12x = 1,062.55 × 621.50
  4. Step 4: Simplify right side
    769.12x = 660,374.83
  5. Step 5: Solve for x
    x = 660,374.83/769.12
  6. Step 6: Final answer
    x = 858.61

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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.