Home / 20,379.06-28,123.40-11,880.95

Finding the Fourth Proportional to 20,379.06, 28,123.40 and 11,880.95

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Solution

The fourth proportional to 20,379.06, 28,123.40 and 11,880.95 is: 16,395.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,379.06 : 28,123.40 = 11,880.95 : x
  2. Step 2: Convert to fraction form
    20,379.06/28,123.40 = 11,880.95/x
  3. Step 3: Cross multiply
    20,379.06x = 28,123.40 × 11,880.95
  4. Step 4: Simplify right side
    20,379.06x = 334,132,598.32
  5. Step 5: Solve for x
    x = 334,132,598.32/20,379.06
  6. Step 6: Final answer
    x = 16,395.88

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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.