Home / 20,155.43-27,826.93-12,987.87

Finding the Fourth Proportional to 20,155.43, 27,826.93 and 12,987.87

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Solution

The fourth proportional to 20,155.43, 27,826.93 and 12,987.87 is: 17,931.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,155.43 : 27,826.93 = 12,987.87 : x
  2. Step 2: Convert to fraction form
    20,155.43/27,826.93 = 12,987.87/x
  3. Step 3: Cross multiply
    20,155.43x = 27,826.93 × 12,987.87
  4. Step 4: Simplify right side
    20,155.43x = 361,412,581.81
  5. Step 5: Solve for x
    x = 361,412,581.81/20,155.43
  6. Step 6: Final answer
    x = 17,931.28

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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.