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Finding the Fourth Proportional to 1,222.11, 1,686.49 and 662.58

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Solution

The fourth proportional to 1,222.11, 1,686.49 and 662.58 is: 914.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.11 : 1,686.49 = 662.58 : x
  2. Step 2: Convert to fraction form
    1,222.11/1,686.49 = 662.58/x
  3. Step 3: Cross multiply
    1,222.11x = 1,686.49 × 662.58
  4. Step 4: Simplify right side
    1,222.11x = 1,117,432.89
  5. Step 5: Solve for x
    x = 1,117,432.89/1,222.11
  6. Step 6: Final answer
    x = 914.35

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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.