Home / 20,853.50-28,780.61-11,898.95

Finding the Fourth Proportional to 20,853.50, 28,780.61 and 11,898.95

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Solution

The fourth proportional to 20,853.50, 28,780.61 and 11,898.95 is: 16,422.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,853.50 : 28,780.61 = 11,898.95 : x
  2. Step 2: Convert to fraction form
    20,853.50/28,780.61 = 11,898.95/x
  3. Step 3: Cross multiply
    20,853.50x = 28,780.61 × 11,898.95
  4. Step 4: Simplify right side
    20,853.50x = 342,459,051.82
  5. Step 5: Solve for x
    x = 342,459,051.82/20,853.50
  6. Step 6: Final answer
    x = 16,422.14

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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.