Home / 21,165.32-31,685.66-15,643.28

Finding the Fourth Proportional to 21,165.32, 31,685.66 and 15,643.28

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Solution

The fourth proportional to 21,165.32, 31,685.66 and 15,643.28 is: 23,418.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,165.32 : 31,685.66 = 15,643.28 : x
  2. Step 2: Convert to fraction form
    21,165.32/31,685.66 = 15,643.28/x
  3. Step 3: Cross multiply
    21,165.32x = 31,685.66 × 15,643.28
  4. Step 4: Simplify right side
    21,165.32x = 495,667,651.36
  5. Step 5: Solve for x
    x = 495,667,651.36/21,165.32
  6. Step 6: Final answer
    x = 23,418.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.