Home / 13,688.10-18,889.33-7,719.78

Finding the Fourth Proportional to 13,688.10, 18,889.33 and 7,719.78

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Solution

The fourth proportional to 13,688.10, 18,889.33 and 7,719.78 is: 10,653.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,688.10 : 18,889.33 = 7,719.78 : x
  2. Step 2: Convert to fraction form
    13,688.10/18,889.33 = 7,719.78/x
  3. Step 3: Cross multiply
    13,688.10x = 18,889.33 × 7,719.78
  4. Step 4: Simplify right side
    13,688.10x = 145,821,471.95
  5. Step 5: Solve for x
    x = 145,821,471.95/13,688.10
  6. Step 6: Final answer
    x = 10,653.16

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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.