Home / 28,428-39,231.45-15,853.56

Finding the Fourth Proportional to 28,428, 39,231.45 and 15,853.56

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Solution

The fourth proportional to 28,428, 39,231.45 and 15,853.56 is: 21,878.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,428 : 39,231.45 = 15,853.56 : x
  2. Step 2: Convert to fraction form
    28,428/39,231.45 = 15,853.56/x
  3. Step 3: Cross multiply
    28,428x = 39,231.45 × 15,853.56
  4. Step 4: Simplify right side
    28,428x = 621,958,146.46
  5. Step 5: Solve for x
    x = 621,958,146.46/28,428
  6. Step 6: Final answer
    x = 21,878.36

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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.