Home / 20,811.78-28,712.23-12,840.18

Finding the Fourth Proportional to 20,811.78, 28,712.23 and 12,840.18

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Solution

The fourth proportional to 20,811.78, 28,712.23 and 12,840.18 is: 17,714.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.78 : 28,712.23 = 12,840.18 : x
  2. Step 2: Convert to fraction form
    20,811.78/28,712.23 = 12,840.18/x
  3. Step 3: Cross multiply
    20,811.78x = 28,712.23 × 12,840.18
  4. Step 4: Simplify right side
    20,811.78x = 368,670,201.40
  5. Step 5: Solve for x
    x = 368,670,201.40/20,811.78
  6. Step 6: Final answer
    x = 17,714.50

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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.