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Finding the Fourth Proportional to 864.38, 1,295.88 and 805.61

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Solution

The fourth proportional to 864.38, 1,295.88 and 805.61 is: 1,207.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.38 : 1,295.88 = 805.61 : x
  2. Step 2: Convert to fraction form
    864.38/1,295.88 = 805.61/x
  3. Step 3: Cross multiply
    864.38x = 1,295.88 × 805.61
  4. Step 4: Simplify right side
    864.38x = 1,043,967.41
  5. Step 5: Solve for x
    x = 1,043,967.41/864.38
  6. Step 6: Final answer
    x = 1,207.77

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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.