Home / 21,137.72-31,708.67-7,814.20

Finding the Fourth Proportional to 21,137.72, 31,708.67 and 7,814.20

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Solution

The fourth proportional to 21,137.72, 31,708.67 and 7,814.20 is: 11,722.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,137.72 : 31,708.67 = 7,814.20 : x
  2. Step 2: Convert to fraction form
    21,137.72/31,708.67 = 7,814.20/x
  3. Step 3: Cross multiply
    21,137.72x = 31,708.67 × 7,814.20
  4. Step 4: Simplify right side
    21,137.72x = 247,777,889.11
  5. Step 5: Solve for x
    x = 247,777,889.11/21,137.72
  6. Step 6: Final answer
    x = 11,722.08

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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.