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Finding the Fourth Proportional to 91,718.80, 137,578.20 and 68,390.80

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Solution

The fourth proportional to 91,718.80, 137,578.20 and 68,390.80 is: 102,586.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,718.80 : 137,578.20 = 68,390.80 : x
  2. Step 2: Convert to fraction form
    91,718.80/137,578.20 = 68,390.80/x
  3. Step 3: Cross multiply
    91,718.80x = 137,578.20 × 68,390.80
  4. Step 4: Simplify right side
    91,718.80x = 9,409,083,160.56
  5. Step 5: Solve for x
    x = 9,409,083,160.56/91,718.80
  6. Step 6: Final answer
    x = 102,586.20

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1.5x scale

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.