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Finding the Fourth Proportional to 432.56, 648.81 and 124.40

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Solution

The fourth proportional to 432.56, 648.81 and 124.40 is: 186.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.56 : 648.81 = 124.40 : x
  2. Step 2: Convert to fraction form
    432.56/648.81 = 124.40/x
  3. Step 3: Cross multiply
    432.56x = 648.81 × 124.40
  4. Step 4: Simplify right side
    432.56x = 80,709.81
  5. Step 5: Solve for x
    x = 80,709.81/432.56
  6. Step 6: Final answer
    x = 186.59

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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.