Home / 20,868.48-31,289.94-9,778.59

Finding the Fourth Proportional to 20,868.48, 31,289.94 and 9,778.59

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Solution

The fourth proportional to 20,868.48, 31,289.94 and 9,778.59 is: 14,661.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,868.48 : 31,289.94 = 9,778.59 : x
  2. Step 2: Convert to fraction form
    20,868.48/31,289.94 = 9,778.59/x
  3. Step 3: Cross multiply
    20,868.48x = 31,289.94 × 9,778.59
  4. Step 4: Simplify right side
    20,868.48x = 305,971,494.38
  5. Step 5: Solve for x
    x = 305,971,494.38/20,868.48
  6. Step 6: Final answer
    x = 14,661.90

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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.