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Finding the Fourth Proportional to 288.64, 432.96 and 126.28

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Solution

The fourth proportional to 288.64, 432.96 and 126.28 is: 189.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.64 : 432.96 = 126.28 : x
  2. Step 2: Convert to fraction form
    288.64/432.96 = 126.28/x
  3. Step 3: Cross multiply
    288.64x = 432.96 × 126.28
  4. Step 4: Simplify right side
    288.64x = 54,674.26
  5. Step 5: Solve for x
    x = 54,674.26/288.64
  6. Step 6: Final answer
    x = 189.42

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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.