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Finding the Fourth Proportional to 13,720.59, 18,945.90 and 9,259.11

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Solution

The fourth proportional to 13,720.59, 18,945.90 and 9,259.11 is: 12,785.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,720.59 : 18,945.90 = 9,259.11 : x
  2. Step 2: Convert to fraction form
    13,720.59/18,945.90 = 9,259.11/x
  3. Step 3: Cross multiply
    13,720.59x = 18,945.90 × 9,259.11
  4. Step 4: Simplify right side
    13,720.59x = 175,422,172.15
  5. Step 5: Solve for x
    x = 175,422,172.15/13,720.59
  6. Step 6: Final answer
    x = 12,785.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.