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Finding the Fourth Proportional to 1,392.15, 2,087.13 and 662.61

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Solution

The fourth proportional to 1,392.15, 2,087.13 and 662.61 is: 993.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.15 : 2,087.13 = 662.61 : x
  2. Step 2: Convert to fraction form
    1,392.15/2,087.13 = 662.61/x
  3. Step 3: Cross multiply
    1,392.15x = 2,087.13 × 662.61
  4. Step 4: Simplify right side
    1,392.15x = 1,382,953.21
  5. Step 5: Solve for x
    x = 1,382,953.21/1,392.15
  6. Step 6: Final answer
    x = 993.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.