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Finding the Fourth Proportional to 20,485.70, 30,720.08 and 7,840.11

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Solution

The fourth proportional to 20,485.70, 30,720.08 and 7,840.11 is: 11,756.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,485.70 : 30,720.08 = 7,840.11 : x
  2. Step 2: Convert to fraction form
    20,485.70/30,720.08 = 7,840.11/x
  3. Step 3: Cross multiply
    20,485.70x = 30,720.08 × 7,840.11
  4. Step 4: Simplify right side
    20,485.70x = 240,848,767.21
  5. Step 5: Solve for x
    x = 240,848,767.21/20,485.70
  6. Step 6: Final answer
    x = 11,756.92

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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.