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Finding the Fourth Proportional to 51.95, 77.91 and 15.39

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Solution

The fourth proportional to 51.95, 77.91 and 15.39 is: 23.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.95 : 77.91 = 15.39 : x
  2. Step 2: Convert to fraction form
    51.95/77.91 = 15.39/x
  3. Step 3: Cross multiply
    51.95x = 77.91 × 15.39
  4. Step 4: Simplify right side
    51.95x = 1,199.03
  5. Step 5: Solve for x
    x = 1,199.03/51.95
  6. Step 6: Final answer
    x = 23.08

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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.