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Finding the Fourth Proportional to 1,222.88, 1,685.76 and 891.68

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Solution

The fourth proportional to 1,222.88, 1,685.76 and 891.68 is: 1,229.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.88 : 1,685.76 = 891.68 : x
  2. Step 2: Convert to fraction form
    1,222.88/1,685.76 = 891.68/x
  3. Step 3: Cross multiply
    1,222.88x = 1,685.76 × 891.68
  4. Step 4: Simplify right side
    1,222.88x = 1,503,158.48
  5. Step 5: Solve for x
    x = 1,503,158.48/1,222.88
  6. Step 6: Final answer
    x = 1,229.20

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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.