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Finding the Fourth Proportional to 91,620.72, 137,301.48 and 38,977.20

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Solution

The fourth proportional to 91,620.72, 137,301.48 and 38,977.20 is: 58,410.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,620.72 : 137,301.48 = 38,977.20 : x
  2. Step 2: Convert to fraction form
    91,620.72/137,301.48 = 38,977.20/x
  3. Step 3: Cross multiply
    91,620.72x = 137,301.48 × 38,977.20
  4. Step 4: Simplify right side
    91,620.72x = 5,351,627,246.26
  5. Step 5: Solve for x
    x = 5,351,627,246.26/91,620.72
  6. Step 6: Final answer
    x = 58,410.67

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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.