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Finding the Fourth Proportional to 20,928.29, 31,388.94 and 6,888.47

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Solution

The fourth proportional to 20,928.29, 31,388.94 and 6,888.47 is: 10,331.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,928.29 : 31,388.94 = 6,888.47 : x
  2. Step 2: Convert to fraction form
    20,928.29/31,388.94 = 6,888.47/x
  3. Step 3: Cross multiply
    20,928.29x = 31,388.94 × 6,888.47
  4. Step 4: Simplify right side
    20,928.29x = 216,221,614.58
  5. Step 5: Solve for x
    x = 216,221,614.58/20,928.29
  6. Step 6: Final answer
    x = 10,331.55

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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.