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Finding the Fourth Proportional to 287.15, 431.56 and 238.70

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Solution

The fourth proportional to 287.15, 431.56 and 238.70 is: 358.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.15 : 431.56 = 238.70 : x
  2. Step 2: Convert to fraction form
    287.15/431.56 = 238.70/x
  3. Step 3: Cross multiply
    287.15x = 431.56 × 238.70
  4. Step 4: Simplify right side
    287.15x = 103,014.75
  5. Step 5: Solve for x
    x = 103,014.75/287.15
  6. Step 6: Final answer
    x = 358.76

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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.