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Finding the Fourth Proportional to 1,375.40, 2,063.20 and 553.68

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Solution

The fourth proportional to 1,375.40, 2,063.20 and 553.68 is: 830.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,375.40 : 2,063.20 = 553.68 : x
  2. Step 2: Convert to fraction form
    1,375.40/2,063.20 = 553.68/x
  3. Step 3: Cross multiply
    1,375.40x = 2,063.20 × 553.68
  4. Step 4: Simplify right side
    1,375.40x = 1,142,339.49
  5. Step 5: Solve for x
    x = 1,142,339.49/1,375.40
  6. Step 6: Final answer
    x = 830.55

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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.