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Finding the Fourth Proportional to 65,981.88, 91,049.94 and 39,122.28

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Solution

The fourth proportional to 65,981.88, 91,049.94 and 39,122.28 is: 53,985.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,981.88 : 91,049.94 = 39,122.28 : x
  2. Step 2: Convert to fraction form
    65,981.88/91,049.94 = 39,122.28/x
  3. Step 3: Cross multiply
    65,981.88x = 91,049.94 × 39,122.28
  4. Step 4: Simplify right side
    65,981.88x = 3,562,081,246.66
  5. Step 5: Solve for x
    x = 3,562,081,246.66/65,981.88
  6. Step 6: Final answer
    x = 53,985.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.