Home / 20,497.78-28,281.99-15,722.56

Finding the Fourth Proportional to 20,497.78, 28,281.99 and 15,722.56

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Solution

The fourth proportional to 20,497.78, 28,281.99 and 15,722.56 is: 21,693.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,497.78 : 28,281.99 = 15,722.56 : x
  2. Step 2: Convert to fraction form
    20,497.78/28,281.99 = 15,722.56/x
  3. Step 3: Cross multiply
    20,497.78x = 28,281.99 × 15,722.56
  4. Step 4: Simplify right side
    20,497.78x = 444,665,284.69
  5. Step 5: Solve for x
    x = 444,665,284.69/20,497.78
  6. Step 6: Final answer
    x = 21,693.34

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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.