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Finding the Fourth Proportional to 288.88, 432.96 and 126.40

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Solution

The fourth proportional to 288.88, 432.96 and 126.40 is: 189.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.88 : 432.96 = 126.40 : x
  2. Step 2: Convert to fraction form
    288.88/432.96 = 126.40/x
  3. Step 3: Cross multiply
    288.88x = 432.96 × 126.40
  4. Step 4: Simplify right side
    288.88x = 54,726.14
  5. Step 5: Solve for x
    x = 54,726.14/288.88
  6. Step 6: Final answer
    x = 189.44

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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.