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Finding the Fourth Proportional to 864.37, 1,278.92 and 861.94

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Solution

The fourth proportional to 864.37, 1,278.92 and 861.94 is: 1,275.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.37 : 1,278.92 = 861.94 : x
  2. Step 2: Convert to fraction form
    864.37/1,278.92 = 861.94/x
  3. Step 3: Cross multiply
    864.37x = 1,278.92 × 861.94
  4. Step 4: Simplify right side
    864.37x = 1,102,345.91
  5. Step 5: Solve for x
    x = 1,102,345.91/864.37
  6. Step 6: Final answer
    x = 1,275.32

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.