Home / 15,821.87-21,789.56-15,477.41

Finding the Fourth Proportional to 15,821.87, 21,789.56 and 15,477.41

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Solution

The fourth proportional to 15,821.87, 21,789.56 and 15,477.41 is: 21,315.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,821.87 : 21,789.56 = 15,477.41 : x
  2. Step 2: Convert to fraction form
    15,821.87/21,789.56 = 15,477.41/x
  3. Step 3: Cross multiply
    15,821.87x = 21,789.56 × 15,477.41
  4. Step 4: Simplify right side
    15,821.87x = 337,246,047.01
  5. Step 5: Solve for x
    x = 337,246,047.01/15,821.87
  6. Step 6: Final answer
    x = 21,315.19

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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.