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Finding the Fourth Proportional to 21,659.60, 29,724.34 and 20,277.20

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Solution

The fourth proportional to 21,659.60, 29,724.34 and 20,277.20 is: 27,827.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,659.60 : 29,724.34 = 20,277.20 : x
  2. Step 2: Convert to fraction form
    21,659.60/29,724.34 = 20,277.20/x
  3. Step 3: Cross multiply
    21,659.60x = 29,724.34 × 20,277.20
  4. Step 4: Simplify right side
    21,659.60x = 602,726,387.05
  5. Step 5: Solve for x
    x = 602,726,387.05/21,659.60
  6. Step 6: Final answer
    x = 27,827.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.