Home / 20,780.31-28,688.48-13,719.14

Finding the Fourth Proportional to 20,780.31, 28,688.48 and 13,719.14

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Solution

The fourth proportional to 20,780.31, 28,688.48 and 13,719.14 is: 18,940.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,780.31 : 28,688.48 = 13,719.14 : x
  2. Step 2: Convert to fraction form
    20,780.31/28,688.48 = 13,719.14/x
  3. Step 3: Cross multiply
    20,780.31x = 28,688.48 × 13,719.14
  4. Step 4: Simplify right side
    20,780.31x = 393,581,061.47
  5. Step 5: Solve for x
    x = 393,581,061.47/20,780.31
  6. Step 6: Final answer
    x = 18,940.10

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1.5x scale

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.