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Finding the Fourth Proportional to 13,608, 18,720.72 and 13,024.80

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Solution

The fourth proportional to 13,608, 18,720.72 and 13,024.80 is: 17,918.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,608 : 18,720.72 = 13,024.80 : x
  2. Step 2: Convert to fraction form
    13,608/18,720.72 = 13,024.80/x
  3. Step 3: Cross multiply
    13,608x = 18,720.72 × 13,024.80
  4. Step 4: Simplify right side
    13,608x = 243,833,633.86
  5. Step 5: Solve for x
    x = 243,833,633.86/13,608
  6. Step 6: Final answer
    x = 17,918.40

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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.