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Finding the Fourth Proportional to 20,947.70, 28,907.70 and 11,873.02

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Solution

The fourth proportional to 20,947.70, 28,907.70 and 11,873.02 is: 16,384.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,947.70 : 28,907.70 = 11,873.02 : x
  2. Step 2: Convert to fraction form
    20,947.70/28,907.70 = 11,873.02/x
  3. Step 3: Cross multiply
    20,947.70x = 28,907.70 × 11,873.02
  4. Step 4: Simplify right side
    20,947.70x = 343,221,613.71
  5. Step 5: Solve for x
    x = 343,221,613.71/20,947.70
  6. Step 6: Final answer
    x = 16,384.69

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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.