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Finding the Fourth Proportional to 19,398.80, 26,720.48 and 13,723.76

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Solution

The fourth proportional to 19,398.80, 26,720.48 and 13,723.76 is: 18,903.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,398.80 : 26,720.48 = 13,723.76 : x
  2. Step 2: Convert to fraction form
    19,398.80/26,720.48 = 13,723.76/x
  3. Step 3: Cross multiply
    19,398.80x = 26,720.48 × 13,723.76
  4. Step 4: Simplify right side
    19,398.80x = 366,705,454.60
  5. Step 5: Solve for x
    x = 366,705,454.60/19,398.80
  6. Step 6: Final answer
    x = 18,903.51

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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.