Home / 21,116.11-31,682.63-7,972.21

Finding the Fourth Proportional to 21,116.11, 31,682.63 and 7,972.21

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Solution

The fourth proportional to 21,116.11, 31,682.63 and 7,972.21 is: 11,961.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,116.11 : 31,682.63 = 7,972.21 : x
  2. Step 2: Convert to fraction form
    21,116.11/31,682.63 = 7,972.21/x
  3. Step 3: Cross multiply
    21,116.11x = 31,682.63 × 7,972.21
  4. Step 4: Simplify right side
    21,116.11x = 252,580,579.71
  5. Step 5: Solve for x
    x = 252,580,579.71/21,116.11
  6. Step 6: Final answer
    x = 11,961.51

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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.