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Finding the Fourth Proportional to 801.23, 1,201.95 and 253.45

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Solution

The fourth proportional to 801.23, 1,201.95 and 253.45 is: 380.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.23 : 1,201.95 = 253.45 : x
  2. Step 2: Convert to fraction form
    801.23/1,201.95 = 253.45/x
  3. Step 3: Cross multiply
    801.23x = 1,201.95 × 253.45
  4. Step 4: Simplify right side
    801.23x = 304,634.23
  5. Step 5: Solve for x
    x = 304,634.23/801.23
  6. Step 6: Final answer
    x = 380.21

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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.