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Finding the Fourth Proportional to 53.95, 74.80 and 48.55

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Solution

The fourth proportional to 53.95, 74.80 and 48.55 is: 67.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.95 : 74.80 = 48.55 : x
  2. Step 2: Convert to fraction form
    53.95/74.80 = 48.55/x
  3. Step 3: Cross multiply
    53.95x = 74.80 × 48.55
  4. Step 4: Simplify right side
    53.95x = 3,631.54
  5. Step 5: Solve for x
    x = 3,631.54/53.95
  6. Step 6: Final answer
    x = 67.31

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.