Home / 20,795.76-28,712.88-12,840.48

Finding the Fourth Proportional to 20,795.76, 28,712.88 and 12,840.48

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Solution

The fourth proportional to 20,795.76, 28,712.88 and 12,840.48 is: 17,728.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,795.76 : 28,712.88 = 12,840.48 : x
  2. Step 2: Convert to fraction form
    20,795.76/28,712.88 = 12,840.48/x
  3. Step 3: Cross multiply
    20,795.76x = 28,712.88 × 12,840.48
  4. Step 4: Simplify right side
    20,795.76x = 368,687,161.38
  5. Step 5: Solve for x
    x = 368,687,161.38/20,795.76
  6. Step 6: Final answer
    x = 17,728.96

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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.