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Finding the Fourth Proportional to 879.68, 1,212.74 and 627.74

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Solution

The fourth proportional to 879.68, 1,212.74 and 627.74 is: 865.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.68 : 1,212.74 = 627.74 : x
  2. Step 2: Convert to fraction form
    879.68/1,212.74 = 627.74/x
  3. Step 3: Cross multiply
    879.68x = 1,212.74 × 627.74
  4. Step 4: Simplify right side
    879.68x = 761,276.21
  5. Step 5: Solve for x
    x = 761,276.21/879.68
  6. Step 6: Final answer
    x = 865.41

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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.