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Finding the Fourth Proportional to 879.91, 1,214.36 and 506.90

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Solution

The fourth proportional to 879.91, 1,214.36 and 506.90 is: 699.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.91 : 1,214.36 = 506.90 : x
  2. Step 2: Convert to fraction form
    879.91/1,214.36 = 506.90/x
  3. Step 3: Cross multiply
    879.91x = 1,214.36 × 506.90
  4. Step 4: Simplify right side
    879.91x = 615,561.49
  5. Step 5: Solve for x
    x = 615,561.49/879.91
  6. Step 6: Final answer
    x = 699.58

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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.