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Finding the Fourth Proportional to 800.95, 1,201.43 and 253.18

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Solution

The fourth proportional to 800.95, 1,201.43 and 253.18 is: 379.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.95 : 1,201.43 = 253.18 : x
  2. Step 2: Convert to fraction form
    800.95/1,201.43 = 253.18/x
  3. Step 3: Cross multiply
    800.95x = 1,201.43 × 253.18
  4. Step 4: Simplify right side
    800.95x = 304,178.05
  5. Step 5: Solve for x
    x = 304,178.05/800.95
  6. Step 6: Final answer
    x = 379.77

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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.