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Finding the Fourth Proportional to 1,222.76, 1,687.38 and 663.20

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Solution

The fourth proportional to 1,222.76, 1,687.38 and 663.20 is: 915.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.76 : 1,687.38 = 663.20 : x
  2. Step 2: Convert to fraction form
    1,222.76/1,687.38 = 663.20/x
  3. Step 3: Cross multiply
    1,222.76x = 1,687.38 × 663.20
  4. Step 4: Simplify right side
    1,222.76x = 1,119,072.15
  5. Step 5: Solve for x
    x = 1,119,072.15/1,222.76
  6. Step 6: Final answer
    x = 915.21

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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.