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Finding the Fourth Proportional to 287.84, 431.87 and 105.36

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Solution

The fourth proportional to 287.84, 431.87 and 105.36 is: 158.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.84 : 431.87 = 105.36 : x
  2. Step 2: Convert to fraction form
    287.84/431.87 = 105.36/x
  3. Step 3: Cross multiply
    287.84x = 431.87 × 105.36
  4. Step 4: Simplify right side
    287.84x = 45,499.68
  5. Step 5: Solve for x
    x = 45,499.68/287.84
  6. Step 6: Final answer
    x = 158.07

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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.