Home / 21,210.79-31,786.62-15,939.64

Finding the Fourth Proportional to 21,210.79, 31,786.62 and 15,939.64

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Solution

The fourth proportional to 21,210.79, 31,786.62 and 15,939.64 is: 23,887.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,210.79 : 31,786.62 = 15,939.64 : x
  2. Step 2: Convert to fraction form
    21,210.79/31,786.62 = 15,939.64/x
  3. Step 3: Cross multiply
    21,210.79x = 31,786.62 × 15,939.64
  4. Step 4: Simplify right side
    21,210.79x = 506,667,385.65
  5. Step 5: Solve for x
    x = 506,667,385.65/21,210.79
  6. Step 6: Final answer
    x = 23,887.25

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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.