Home / 20,713.78-31,070.67-5,131.42

Finding the Fourth Proportional to 20,713.78, 31,070.67 and 5,131.42

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Solution

The fourth proportional to 20,713.78, 31,070.67 and 5,131.42 is: 7,697.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,713.78 : 31,070.67 = 5,131.42 : x
  2. Step 2: Convert to fraction form
    20,713.78/31,070.67 = 5,131.42/x
  3. Step 3: Cross multiply
    20,713.78x = 31,070.67 × 5,131.42
  4. Step 4: Simplify right side
    20,713.78x = 159,436,657.45
  5. Step 5: Solve for x
    x = 159,436,657.45/20,713.78
  6. Step 6: Final answer
    x = 7,697.13

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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.