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Finding the Fourth Proportional to 1,222.40, 1,686.92 and 662.87

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Solution

The fourth proportional to 1,222.40, 1,686.92 and 662.87 is: 914.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.40 : 1,686.92 = 662.87 : x
  2. Step 2: Convert to fraction form
    1,222.40/1,686.92 = 662.87/x
  3. Step 3: Cross multiply
    1,222.40x = 1,686.92 × 662.87
  4. Step 4: Simplify right side
    1,222.40x = 1,118,205.35
  5. Step 5: Solve for x
    x = 1,118,205.35/1,222.40
  6. Step 6: Final answer
    x = 914.76

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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.