Home / 20,455.20-28,216.66-12,888.52

Finding the Fourth Proportional to 20,455.20, 28,216.66 and 12,888.52

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Solution

The fourth proportional to 20,455.20, 28,216.66 and 12,888.52 is: 17,778.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,455.20 : 28,216.66 = 12,888.52 : x
  2. Step 2: Convert to fraction form
    20,455.20/28,216.66 = 12,888.52/x
  3. Step 3: Cross multiply
    20,455.20x = 28,216.66 × 12,888.52
  4. Step 4: Simplify right side
    20,455.20x = 363,670,965.71
  5. Step 5: Solve for x
    x = 363,670,965.71/20,455.20
  6. Step 6: Final answer
    x = 17,778.90

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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.