Home / 20,815.92-31,206.78-9,717.12

Finding the Fourth Proportional to 20,815.92, 31,206.78 and 9,717.12

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Solution

The fourth proportional to 20,815.92, 31,206.78 and 9,717.12 is: 14,567.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,815.92 : 31,206.78 = 9,717.12 : x
  2. Step 2: Convert to fraction form
    20,815.92/31,206.78 = 9,717.12/x
  3. Step 3: Cross multiply
    20,815.92x = 31,206.78 × 9,717.12
  4. Step 4: Simplify right side
    20,815.92x = 303,240,026.07
  5. Step 5: Solve for x
    x = 303,240,026.07/20,815.92
  6. Step 6: Final answer
    x = 14,567.70

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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.