Home / 15,712.80-21,683.66-8,639.68

Finding the Fourth Proportional to 15,712.80, 21,683.66 and 8,639.68

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Solution

The fourth proportional to 15,712.80, 21,683.66 and 8,639.68 is: 11,922.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,712.80 : 21,683.66 = 8,639.68 : x
  2. Step 2: Convert to fraction form
    15,712.80/21,683.66 = 8,639.68/x
  3. Step 3: Cross multiply
    15,712.80x = 21,683.66 × 8,639.68
  4. Step 4: Simplify right side
    15,712.80x = 187,339,883.63
  5. Step 5: Solve for x
    x = 187,339,883.63/15,712.80
  6. Step 6: Final answer
    x = 11,922.76

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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.