Home / 15,712.77-21,683.71-8,639.65

Finding the Fourth Proportional to 15,712.77, 21,683.71 and 8,639.65

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Solution

The fourth proportional to 15,712.77, 21,683.71 and 8,639.65 is: 11,922.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,712.77 : 21,683.71 = 8,639.65 : x
  2. Step 2: Convert to fraction form
    15,712.77/21,683.71 = 8,639.65/x
  3. Step 3: Cross multiply
    15,712.77x = 21,683.71 × 8,639.65
  4. Step 4: Simplify right side
    15,712.77x = 187,339,665.10
  5. Step 5: Solve for x
    x = 187,339,665.10/15,712.77
  6. Step 6: Final answer
    x = 11,922.77

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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.