Home / 21,316.80-29,356.38-20,858.88

Finding the Fourth Proportional to 21,316.80, 29,356.38 and 20,858.88

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Solution

The fourth proportional to 21,316.80, 29,356.38 and 20,858.88 is: 28,725.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,316.80 : 29,356.38 = 20,858.88 : x
  2. Step 2: Convert to fraction form
    21,316.80/29,356.38 = 20,858.88/x
  3. Step 3: Cross multiply
    21,316.80x = 29,356.38 × 20,858.88
  4. Step 4: Simplify right side
    21,316.80x = 612,341,207.65
  5. Step 5: Solve for x
    x = 612,341,207.65/21,316.80
  6. Step 6: Final answer
    x = 28,725.76

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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.