Home / 20,740.80-31,115.20-8,894.40

Finding the Fourth Proportional to 20,740.80, 31,115.20 and 8,894.40

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Solution

The fourth proportional to 20,740.80, 31,115.20 and 8,894.40 is: 13,343.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,740.80 : 31,115.20 = 8,894.40 : x
  2. Step 2: Convert to fraction form
    20,740.80/31,115.20 = 8,894.40/x
  3. Step 3: Cross multiply
    20,740.80x = 31,115.20 × 8,894.40
  4. Step 4: Simplify right side
    20,740.80x = 276,751,034.88
  5. Step 5: Solve for x
    x = 276,751,034.88/20,740.80
  6. Step 6: Final answer
    x = 13,343.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.