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Finding the Fourth Proportional to 1,326.57, 1,990.94 and 557.61

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Solution

The fourth proportional to 1,326.57, 1,990.94 and 557.61 is: 836.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.57 : 1,990.94 = 557.61 : x
  2. Step 2: Convert to fraction form
    1,326.57/1,990.94 = 557.61/x
  3. Step 3: Cross multiply
    1,326.57x = 1,990.94 × 557.61
  4. Step 4: Simplify right side
    1,326.57x = 1,110,168.05
  5. Step 5: Solve for x
    x = 1,110,168.05/1,326.57
  6. Step 6: Final answer
    x = 836.87

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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.