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Finding the Fourth Proportional to 91,974.30, 137,961.45 and 68,646.30

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Solution

The fourth proportional to 91,974.30, 137,961.45 and 68,646.30 is: 102,969.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,974.30 : 137,961.45 = 68,646.30 : x
  2. Step 2: Convert to fraction form
    91,974.30/137,961.45 = 68,646.30/x
  3. Step 3: Cross multiply
    91,974.30x = 137,961.45 × 68,646.30
  4. Step 4: Simplify right side
    91,974.30x = 9,470,543,085.14
  5. Step 5: Solve for x
    x = 9,470,543,085.14/91,974.30
  6. Step 6: Final answer
    x = 102,969.45

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Similar ratio
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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.