Home / 20,923.10-28,869.31-12,428.02

Finding the Fourth Proportional to 20,923.10, 28,869.31 and 12,428.02

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Solution

The fourth proportional to 20,923.10, 28,869.31 and 12,428.02 is: 17,147.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,923.10 : 28,869.31 = 12,428.02 : x
  2. Step 2: Convert to fraction form
    20,923.10/28,869.31 = 12,428.02/x
  3. Step 3: Cross multiply
    20,923.10x = 28,869.31 × 12,428.02
  4. Step 4: Simplify right side
    20,923.10x = 358,788,362.07
  5. Step 5: Solve for x
    x = 358,788,362.07/20,923.10
  6. Step 6: Final answer
    x = 17,147.95

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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.