Home / 20,971.26-28,935.57-15,309.09

Finding the Fourth Proportional to 20,971.26, 28,935.57 and 15,309.09

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Solution

The fourth proportional to 20,971.26, 28,935.57 and 15,309.09 is: 21,123.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,971.26 : 28,935.57 = 15,309.09 : x
  2. Step 2: Convert to fraction form
    20,971.26/28,935.57 = 15,309.09/x
  3. Step 3: Cross multiply
    20,971.26x = 28,935.57 × 15,309.09
  4. Step 4: Simplify right side
    20,971.26x = 442,977,302.74
  5. Step 5: Solve for x
    x = 442,977,302.74/20,971.26
  6. Step 6: Final answer
    x = 21,123.07

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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.