Home / 20,878.92-31,329.15-9,786.74

Finding the Fourth Proportional to 20,878.92, 31,329.15 and 9,786.74

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Solution

The fourth proportional to 20,878.92, 31,329.15 and 9,786.74 is: 14,685.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,878.92 : 31,329.15 = 9,786.74 : x
  2. Step 2: Convert to fraction form
    20,878.92/31,329.15 = 9,786.74/x
  3. Step 3: Cross multiply
    20,878.92x = 31,329.15 × 9,786.74
  4. Step 4: Simplify right side
    20,878.92x = 306,610,088.83
  5. Step 5: Solve for x
    x = 306,610,088.83/20,878.92
  6. Step 6: Final answer
    x = 14,685.15

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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.