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Finding the Fourth Proportional to 13,399.40, 20,079.30 and 9,709.40

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Solution

The fourth proportional to 13,399.40, 20,079.30 and 9,709.40 is: 14,549.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,399.40 : 20,079.30 = 9,709.40 : x
  2. Step 2: Convert to fraction form
    13,399.40/20,079.30 = 9,709.40/x
  3. Step 3: Cross multiply
    13,399.40x = 20,079.30 × 9,709.40
  4. Step 4: Simplify right side
    13,399.40x = 194,957,955.42
  5. Step 5: Solve for x
    x = 194,957,955.42/13,399.40
  6. Step 6: Final answer
    x = 14,549.75

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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.