Home / 21,107.93-31,639.10-13,717.69

Finding the Fourth Proportional to 21,107.93, 31,639.10 and 13,717.69

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Solution

The fourth proportional to 21,107.93, 31,639.10 and 13,717.69 is: 20,561.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,107.93 : 31,639.10 = 13,717.69 : x
  2. Step 2: Convert to fraction form
    21,107.93/31,639.10 = 13,717.69/x
  3. Step 3: Cross multiply
    21,107.93x = 31,639.10 × 13,717.69
  4. Step 4: Simplify right side
    21,107.93x = 434,015,217.99
  5. Step 5: Solve for x
    x = 434,015,217.99/21,107.93
  6. Step 6: Final answer
    x = 20,561.72

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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.