Home / 20,971.64-28,936.10-15,309.47

Finding the Fourth Proportional to 20,971.64, 28,936.10 and 15,309.47

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Solution

The fourth proportional to 20,971.64, 28,936.10 and 15,309.47 is: 21,123.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,971.64 : 28,936.10 = 15,309.47 : x
  2. Step 2: Convert to fraction form
    20,971.64/28,936.10 = 15,309.47/x
  3. Step 3: Cross multiply
    20,971.64x = 28,936.10 × 15,309.47
  4. Step 4: Simplify right side
    20,971.64x = 442,996,133.64
  5. Step 5: Solve for x
    x = 442,996,133.64/20,971.64
  6. Step 6: Final answer
    x = 21,123.59

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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.