Home / 19,720.31-27,216.61-11,220.78

Finding the Fourth Proportional to 19,720.31, 27,216.61 and 11,220.78

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Solution

The fourth proportional to 19,720.31, 27,216.61 and 11,220.78 is: 15,486.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,720.31 : 27,216.61 = 11,220.78 : x
  2. Step 2: Convert to fraction form
    19,720.31/27,216.61 = 11,220.78/x
  3. Step 3: Cross multiply
    19,720.31x = 27,216.61 × 11,220.78
  4. Step 4: Simplify right side
    19,720.31x = 305,391,667.17
  5. Step 5: Solve for x
    x = 305,391,667.17/19,720.31
  6. Step 6: Final answer
    x = 15,486.15

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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.