Home / 21,000.32-28,979.52-11,568.80

Finding the Fourth Proportional to 21,000.32, 28,979.52 and 11,568.80

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Solution

The fourth proportional to 21,000.32, 28,979.52 and 11,568.80 is: 15,964.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.32 : 28,979.52 = 11,568.80 : x
  2. Step 2: Convert to fraction form
    21,000.32/28,979.52 = 11,568.80/x
  3. Step 3: Cross multiply
    21,000.32x = 28,979.52 × 11,568.80
  4. Step 4: Simplify right side
    21,000.32x = 335,258,270.98
  5. Step 5: Solve for x
    x = 335,258,270.98/21,000.32
  6. Step 6: Final answer
    x = 15,964.44

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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.