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Finding the Fourth Proportional to 287.80, 397.07 and 250.90

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Solution

The fourth proportional to 287.80, 397.07 and 250.90 is: 346.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.80 : 397.07 = 250.90 : x
  2. Step 2: Convert to fraction form
    287.80/397.07 = 250.90/x
  3. Step 3: Cross multiply
    287.80x = 397.07 × 250.90
  4. Step 4: Simplify right side
    287.80x = 99,624.86
  5. Step 5: Solve for x
    x = 99,624.86/287.80
  6. Step 6: Final answer
    x = 346.16

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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.