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Finding the Fourth Proportional to 432.78, 648.80 and 189.12

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Solution

The fourth proportional to 432.78, 648.80 and 189.12 is: 283.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.78 : 648.80 = 189.12 : x
  2. Step 2: Convert to fraction form
    432.78/648.80 = 189.12/x
  3. Step 3: Cross multiply
    432.78x = 648.80 × 189.12
  4. Step 4: Simplify right side
    432.78x = 122,701.06
  5. Step 5: Solve for x
    x = 122,701.06/432.78
  6. Step 6: Final answer
    x = 283.52

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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.