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Finding the Fourth Proportional to 13,515.52, 20,259.52 and 6,485.20

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Solution

The fourth proportional to 13,515.52, 20,259.52 and 6,485.20 is: 9,721.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,515.52 : 20,259.52 = 6,485.20 : x
  2. Step 2: Convert to fraction form
    13,515.52/20,259.52 = 6,485.20/x
  3. Step 3: Cross multiply
    13,515.52x = 20,259.52 × 6,485.20
  4. Step 4: Simplify right side
    13,515.52x = 131,387,039.10
  5. Step 5: Solve for x
    x = 131,387,039.10/13,515.52
  6. Step 6: Final answer
    x = 9,721.20

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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.