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Finding the Fourth Proportional to 13,447.40, 20,171.10 and 13,188.20

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Solution

The fourth proportional to 13,447.40, 20,171.10 and 13,188.20 is: 19,782.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,447.40 : 20,171.10 = 13,188.20 : x
  2. Step 2: Convert to fraction form
    13,447.40/20,171.10 = 13,188.20/x
  3. Step 3: Cross multiply
    13,447.40x = 20,171.10 × 13,188.20
  4. Step 4: Simplify right side
    13,447.40x = 266,020,501.02
  5. Step 5: Solve for x
    x = 266,020,501.02/13,447.40
  6. Step 6: Final answer
    x = 19,782.30

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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.