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Finding the Fourth Proportional to 61, 91.26 and 36.84

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Solution

The fourth proportional to 61, 91.26 and 36.84 is: 55.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    61 : 91.26 = 36.84 : x
  2. Step 2: Convert to fraction form
    61/91.26 = 36.84/x
  3. Step 3: Cross multiply
    61x = 91.26 × 36.84
  4. Step 4: Simplify right side
    61x = 3,362.02
  5. Step 5: Solve for x
    x = 3,362.02/61
  6. Step 6: Final answer
    x = 55.12

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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.