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Finding the Fourth Proportional to 18,643.20, 25,728.48 and 12,681.60

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Solution

The fourth proportional to 18,643.20, 25,728.48 and 12,681.60 is: 17,501.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,643.20 : 25,728.48 = 12,681.60 : x
  2. Step 2: Convert to fraction form
    18,643.20/25,728.48 = 12,681.60/x
  3. Step 3: Cross multiply
    18,643.20x = 25,728.48 × 12,681.60
  4. Step 4: Simplify right side
    18,643.20x = 326,278,291.97
  5. Step 5: Solve for x
    x = 326,278,291.97/18,643.20
  6. Step 6: Final answer
    x = 17,501.20

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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.