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Finding the Fourth Proportional to 65,990.31, 91,065.51 and 37,309.50

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Solution

The fourth proportional to 65,990.31, 91,065.51 and 37,309.50 is: 51,486.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,990.31 : 91,065.51 = 37,309.50 : x
  2. Step 2: Convert to fraction form
    65,990.31/91,065.51 = 37,309.50/x
  3. Step 3: Cross multiply
    65,990.31x = 91,065.51 × 37,309.50
  4. Step 4: Simplify right side
    65,990.31x = 3,397,608,190.02
  5. Step 5: Solve for x
    x = 3,397,608,190.02/65,990.31
  6. Step 6: Final answer
    x = 51,486.47

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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.