Home / 13,139.31-19,685.28-7,209.81

Finding the Fourth Proportional to 13,139.31, 19,685.28 and 7,209.81

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Solution

The fourth proportional to 13,139.31, 19,685.28 and 7,209.81 is: 10,801.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,139.31 : 19,685.28 = 7,209.81 : x
  2. Step 2: Convert to fraction form
    13,139.31/19,685.28 = 7,209.81/x
  3. Step 3: Cross multiply
    13,139.31x = 19,685.28 × 7,209.81
  4. Step 4: Simplify right side
    13,139.31x = 141,927,115.08
  5. Step 5: Solve for x
    x = 141,927,115.08/13,139.31
  6. Step 6: Final answer
    x = 10,801.71

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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.