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Finding the Fourth Proportional to 134.78, 202.16 and 43.47

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Solution

The fourth proportional to 134.78, 202.16 and 43.47 is: 65.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    134.78 : 202.16 = 43.47 : x
  2. Step 2: Convert to fraction form
    134.78/202.16 = 43.47/x
  3. Step 3: Cross multiply
    134.78x = 202.16 × 43.47
  4. Step 4: Simplify right side
    134.78x = 8,788.00
  5. Step 5: Solve for x
    x = 8,788.00/134.78
  6. Step 6: Final answer
    x = 65.21

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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.