Home / 13,721.28-18,934.74-8,415.24

Finding the Fourth Proportional to 13,721.28, 18,934.74 and 8,415.24

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Solution

The fourth proportional to 13,721.28, 18,934.74 and 8,415.24 is: 11,612.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,721.28 : 18,934.74 = 8,415.24 : x
  2. Step 2: Convert to fraction form
    13,721.28/18,934.74 = 8,415.24/x
  3. Step 3: Cross multiply
    13,721.28x = 18,934.74 × 8,415.24
  4. Step 4: Simplify right side
    13,721.28x = 159,340,381.44
  5. Step 5: Solve for x
    x = 159,340,381.44/13,721.28
  6. Step 6: Final answer
    x = 11,612.65

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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.