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Finding the Fourth Proportional to 879.15, 1,212.71 and 568.65

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Solution

The fourth proportional to 879.15, 1,212.71 and 568.65 is: 784.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.15 : 1,212.71 = 568.65 : x
  2. Step 2: Convert to fraction form
    879.15/1,212.71 = 568.65/x
  3. Step 3: Cross multiply
    879.15x = 1,212.71 × 568.65
  4. Step 4: Simplify right side
    879.15x = 689,607.54
  5. Step 5: Solve for x
    x = 689,607.54/879.15
  6. Step 6: Final answer
    x = 784.40

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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.