Home / 20,281.14-27,987.12-12,731.40

Finding the Fourth Proportional to 20,281.14, 27,987.12 and 12,731.40

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Solution

The fourth proportional to 20,281.14, 27,987.12 and 12,731.40 is: 17,568.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,281.14 : 27,987.12 = 12,731.40 : x
  2. Step 2: Convert to fraction form
    20,281.14/27,987.12 = 12,731.40/x
  3. Step 3: Cross multiply
    20,281.14x = 27,987.12 × 12,731.40
  4. Step 4: Simplify right side
    20,281.14x = 356,315,219.57
  5. Step 5: Solve for x
    x = 356,315,219.57/20,281.14
  6. Step 6: Final answer
    x = 17,568.80

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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.