Home / 20,937.90-31,406.86-7,788.56

Finding the Fourth Proportional to 20,937.90, 31,406.86 and 7,788.56

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Solution

The fourth proportional to 20,937.90, 31,406.86 and 7,788.56 is: 11,682.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,937.90 : 31,406.86 = 7,788.56 : x
  2. Step 2: Convert to fraction form
    20,937.90/31,406.86 = 7,788.56/x
  3. Step 3: Cross multiply
    20,937.90x = 31,406.86 × 7,788.56
  4. Step 4: Simplify right side
    20,937.90x = 244,614,213.52
  5. Step 5: Solve for x
    x = 244,614,213.52/20,937.90
  6. Step 6: Final answer
    x = 11,682.84

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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.