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Finding the Fourth Proportional to 287.95, 431.78 and 125.56

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Solution

The fourth proportional to 287.95, 431.78 and 125.56 is: 188.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.95 : 431.78 = 125.56 : x
  2. Step 2: Convert to fraction form
    287.95/431.78 = 125.56/x
  3. Step 3: Cross multiply
    287.95x = 431.78 × 125.56
  4. Step 4: Simplify right side
    287.95x = 54,214.30
  5. Step 5: Solve for x
    x = 54,214.30/287.95
  6. Step 6: Final answer
    x = 188.28

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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.