Home / 20,988.99-31,451.76-12,659.76

Finding the Fourth Proportional to 20,988.99, 31,451.76 and 12,659.76

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Solution

The fourth proportional to 20,988.99, 31,451.76 and 12,659.76 is: 18,970.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988.99 : 31,451.76 = 12,659.76 : x
  2. Step 2: Convert to fraction form
    20,988.99/31,451.76 = 12,659.76/x
  3. Step 3: Cross multiply
    20,988.99x = 31,451.76 × 12,659.76
  4. Step 4: Simplify right side
    20,988.99x = 398,171,733.18
  5. Step 5: Solve for x
    x = 398,171,733.18/20,988.99
  6. Step 6: Final answer
    x = 18,970.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.