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Finding the Fourth Proportional to 53.78, 80.64 and 39.50

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Solution

The fourth proportional to 53.78, 80.64 and 39.50 is: 59.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.78 : 80.64 = 39.50 : x
  2. Step 2: Convert to fraction form
    53.78/80.64 = 39.50/x
  3. Step 3: Cross multiply
    53.78x = 80.64 × 39.50
  4. Step 4: Simplify right side
    53.78x = 3,185.28
  5. Step 5: Solve for x
    x = 3,185.28/53.78
  6. Step 6: Final answer
    x = 59.23

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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.