Home / 21,140.50-31,722.42-11,785.78

Finding the Fourth Proportional to 21,140.50, 31,722.42 and 11,785.78

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Solution

The fourth proportional to 21,140.50, 31,722.42 and 11,785.78 is: 17,685.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,140.50 : 31,722.42 = 11,785.78 : x
  2. Step 2: Convert to fraction form
    21,140.50/31,722.42 = 11,785.78/x
  3. Step 3: Cross multiply
    21,140.50x = 31,722.42 × 11,785.78
  4. Step 4: Simplify right side
    21,140.50x = 373,873,463.19
  5. Step 5: Solve for x
    x = 373,873,463.19/21,140.50
  6. Step 6: Final answer
    x = 17,685.18

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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.