Home / 20,817.25-28,727.91-11,385.79

Finding the Fourth Proportional to 20,817.25, 28,727.91 and 11,385.79

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Solution

The fourth proportional to 20,817.25, 28,727.91 and 11,385.79 is: 15,712.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,817.25 : 28,727.91 = 11,385.79 : x
  2. Step 2: Convert to fraction form
    20,817.25/28,727.91 = 11,385.79/x
  3. Step 3: Cross multiply
    20,817.25x = 28,727.91 × 11,385.79
  4. Step 4: Simplify right side
    20,817.25x = 327,089,950.40
  5. Step 5: Solve for x
    x = 327,089,950.40/20,817.25
  6. Step 6: Final answer
    x = 15,712.45

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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.