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Finding the Fourth Proportional to 288.76, 432.92 and 115.28

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Solution

The fourth proportional to 288.76, 432.92 and 115.28 is: 172.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.76 : 432.92 = 115.28 : x
  2. Step 2: Convert to fraction form
    288.76/432.92 = 115.28/x
  3. Step 3: Cross multiply
    288.76x = 432.92 × 115.28
  4. Step 4: Simplify right side
    288.76x = 49,908.39
  5. Step 5: Solve for x
    x = 49,908.39/288.76
  6. Step 6: Final answer
    x = 172.84

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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.