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Finding the Fourth Proportional to 91,980.46, 137,855.32 and 39,328.14

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Solution

The fourth proportional to 91,980.46, 137,855.32 and 39,328.14 is: 58,942.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,980.46 : 137,855.32 = 39,328.14 : x
  2. Step 2: Convert to fraction form
    91,980.46/137,855.32 = 39,328.14/x
  3. Step 3: Cross multiply
    91,980.46x = 137,855.32 × 39,328.14
  4. Step 4: Simplify right side
    91,980.46x = 5,421,593,324.70
  5. Step 5: Solve for x
    x = 5,421,593,324.70/91,980.46
  6. Step 6: Final answer
    x = 58,942.88

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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.