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Finding the Fourth Proportional to 1,540.84, 2,311.65 and 553.61

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Solution

The fourth proportional to 1,540.84, 2,311.65 and 553.61 is: 830.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,540.84 : 2,311.65 = 553.61 : x
  2. Step 2: Convert to fraction form
    1,540.84/2,311.65 = 553.61/x
  3. Step 3: Cross multiply
    1,540.84x = 2,311.65 × 553.61
  4. Step 4: Simplify right side
    1,540.84x = 1,279,752.56
  5. Step 5: Solve for x
    x = 1,279,752.56/1,540.84
  6. Step 6: Final answer
    x = 830.56

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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.