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Finding the Fourth Proportional to 18,659.72, 25,724.64 and 13,345.28

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Solution

The fourth proportional to 18,659.72, 25,724.64 and 13,345.28 is: 18,398.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,659.72 : 25,724.64 = 13,345.28 : x
  2. Step 2: Convert to fraction form
    18,659.72/25,724.64 = 13,345.28/x
  3. Step 3: Cross multiply
    18,659.72x = 25,724.64 × 13,345.28
  4. Step 4: Simplify right side
    18,659.72x = 343,302,523.70
  5. Step 5: Solve for x
    x = 343,302,523.70/18,659.72
  6. Step 6: Final answer
    x = 18,398.05

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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.