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Finding the Fourth Proportional to 879.78, 1,214.33 and 506.87

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Solution

The fourth proportional to 879.78, 1,214.33 and 506.87 is: 699.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.78 : 1,214.33 = 506.87 : x
  2. Step 2: Convert to fraction form
    879.78/1,214.33 = 506.87/x
  3. Step 3: Cross multiply
    879.78x = 1,214.33 × 506.87
  4. Step 4: Simplify right side
    879.78x = 615,498.84
  5. Step 5: Solve for x
    x = 615,498.84/879.78
  6. Step 6: Final answer
    x = 699.61

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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.