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Finding the Fourth Proportional to 862.32, 1,298.61 and 776.66

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Solution

The fourth proportional to 862.32, 1,298.61 and 776.66 is: 1,169.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.32 : 1,298.61 = 776.66 : x
  2. Step 2: Convert to fraction form
    862.32/1,298.61 = 776.66/x
  3. Step 3: Cross multiply
    862.32x = 1,298.61 × 776.66
  4. Step 4: Simplify right side
    862.32x = 1,008,578.44
  5. Step 5: Solve for x
    x = 1,008,578.44/862.32
  6. Step 6: Final answer
    x = 1,169.61

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.