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Finding the Fourth Proportional to 1,453.12, 2,005.28 and 863.70

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Solution

The fourth proportional to 1,453.12, 2,005.28 and 863.70 is: 1,191.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,453.12 : 2,005.28 = 863.70 : x
  2. Step 2: Convert to fraction form
    1,453.12/2,005.28 = 863.70/x
  3. Step 3: Cross multiply
    1,453.12x = 2,005.28 × 863.70
  4. Step 4: Simplify right side
    1,453.12x = 1,731,960.34
  5. Step 5: Solve for x
    x = 1,731,960.34/1,453.12
  6. Step 6: Final answer
    x = 1,191.89

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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.