Home / 20,711.75-28,582.18-11,280.31

Finding the Fourth Proportional to 20,711.75, 28,582.18 and 11,280.31

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Solution

The fourth proportional to 20,711.75, 28,582.18 and 11,280.31 is: 15,566.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,711.75 : 28,582.18 = 11,280.31 : x
  2. Step 2: Convert to fraction form
    20,711.75/28,582.18 = 11,280.31/x
  3. Step 3: Cross multiply
    20,711.75x = 28,582.18 × 11,280.31
  4. Step 4: Simplify right side
    20,711.75x = 322,415,751.22
  5. Step 5: Solve for x
    x = 322,415,751.22/20,711.75
  6. Step 6: Final answer
    x = 15,566.81

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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.