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Finding the Fourth Proportional to 287.98, 432.20 and 105.49

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Solution

The fourth proportional to 287.98, 432.20 and 105.49 is: 158.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.98 : 432.20 = 105.49 : x
  2. Step 2: Convert to fraction form
    287.98/432.20 = 105.49/x
  3. Step 3: Cross multiply
    287.98x = 432.20 × 105.49
  4. Step 4: Simplify right side
    287.98x = 45,592.78
  5. Step 5: Solve for x
    x = 45,592.78/287.98
  6. Step 6: Final answer
    x = 158.32

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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.