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Finding the Fourth Proportional to 288.11, 432.38 and 105.55

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Solution

The fourth proportional to 288.11, 432.38 and 105.55 is: 158.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.11 : 432.38 = 105.55 : x
  2. Step 2: Convert to fraction form
    288.11/432.38 = 105.55/x
  3. Step 3: Cross multiply
    288.11x = 432.38 × 105.55
  4. Step 4: Simplify right side
    288.11x = 45,635.02
  5. Step 5: Solve for x
    x = 45,635.02/288.11
  6. Step 6: Final answer
    x = 158.40

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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.