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Finding the Fourth Proportional to 889.74, 1,229.02 and 678.65

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Solution

The fourth proportional to 889.74, 1,229.02 and 678.65 is: 937.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.74 : 1,229.02 = 678.65 : x
  2. Step 2: Convert to fraction form
    889.74/1,229.02 = 678.65/x
  3. Step 3: Cross multiply
    889.74x = 1,229.02 × 678.65
  4. Step 4: Simplify right side
    889.74x = 834,066.58
  5. Step 5: Solve for x
    x = 834,066.58/889.74
  6. Step 6: Final answer
    x = 937.43

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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.