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Finding the Fourth Proportional to 879.77, 1,214.11 and 506.72

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Solution

The fourth proportional to 879.77, 1,214.11 and 506.72 is: 699.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.77 : 1,214.11 = 506.72 : x
  2. Step 2: Convert to fraction form
    879.77/1,214.11 = 506.72/x
  3. Step 3: Cross multiply
    879.77x = 1,214.11 × 506.72
  4. Step 4: Simplify right side
    879.77x = 615,205.22
  5. Step 5: Solve for x
    x = 615,205.22/879.77
  6. Step 6: Final answer
    x = 699.28

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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.