Home / 27,720.19-38,258.52-15,781.87

Finding the Fourth Proportional to 27,720.19, 38,258.52 and 15,781.87

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Solution

The fourth proportional to 27,720.19, 38,258.52 and 15,781.87 is: 21,781.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,720.19 : 38,258.52 = 15,781.87 : x
  2. Step 2: Convert to fraction form
    27,720.19/38,258.52 = 15,781.87/x
  3. Step 3: Cross multiply
    27,720.19x = 38,258.52 × 15,781.87
  4. Step 4: Simplify right side
    27,720.19x = 603,790,989.03
  5. Step 5: Solve for x
    x = 603,790,989.03/27,720.19
  6. Step 6: Final answer
    x = 21,781.63

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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.