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Finding the Fourth Proportional to 53.56, 80.40 and 48.40

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Solution

The fourth proportional to 53.56, 80.40 and 48.40 is: 72.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.56 : 80.40 = 48.40 : x
  2. Step 2: Convert to fraction form
    53.56/80.40 = 48.40/x
  3. Step 3: Cross multiply
    53.56x = 80.40 × 48.40
  4. Step 4: Simplify right side
    53.56x = 3,891.36
  5. Step 5: Solve for x
    x = 3,891.36/53.56
  6. Step 6: Final answer
    x = 72.65

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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.