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Finding the Fourth Proportional to 453.39, 625.80 and 287.70

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Solution

The fourth proportional to 453.39, 625.80 and 287.70 is: 397.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    453.39 : 625.80 = 287.70 : x
  2. Step 2: Convert to fraction form
    453.39/625.80 = 287.70/x
  3. Step 3: Cross multiply
    453.39x = 625.80 × 287.70
  4. Step 4: Simplify right side
    453.39x = 180,042.66
  5. Step 5: Solve for x
    x = 180,042.66/453.39
  6. Step 6: Final answer
    x = 397.10

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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.