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Finding the Fourth Proportional to 777.98, 1,165.87 and 387.61

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Solution

The fourth proportional to 777.98, 1,165.87 and 387.61 is: 580.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.98 : 1,165.87 = 387.61 : x
  2. Step 2: Convert to fraction form
    777.98/1,165.87 = 387.61/x
  3. Step 3: Cross multiply
    777.98x = 1,165.87 × 387.61
  4. Step 4: Simplify right side
    777.98x = 451,895.10
  5. Step 5: Solve for x
    x = 451,895.10/777.98
  6. Step 6: Final answer
    x = 580.86

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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.