Home / 21,159.28-31,745.40-13,357.36

Finding the Fourth Proportional to 21,159.28, 31,745.40 and 13,357.36

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Solution

The fourth proportional to 21,159.28, 31,745.40 and 13,357.36 is: 20,040.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,159.28 : 31,745.40 = 13,357.36 : x
  2. Step 2: Convert to fraction form
    21,159.28/31,745.40 = 13,357.36/x
  3. Step 3: Cross multiply
    21,159.28x = 31,745.40 × 13,357.36
  4. Step 4: Simplify right side
    21,159.28x = 424,034,736.14
  5. Step 5: Solve for x
    x = 424,034,736.14/21,159.28
  6. Step 6: Final answer
    x = 20,040.13

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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.