Home / 21,160.91-31,742.94-7,120.88

Finding the Fourth Proportional to 21,160.91, 31,742.94 and 7,120.88

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Solution

The fourth proportional to 21,160.91, 31,742.94 and 7,120.88 is: 10,681.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,160.91 : 31,742.94 = 7,120.88 : x
  2. Step 2: Convert to fraction form
    21,160.91/31,742.94 = 7,120.88/x
  3. Step 3: Cross multiply
    21,160.91x = 31,742.94 × 7,120.88
  4. Step 4: Simplify right side
    21,160.91x = 226,037,666.59
  5. Step 5: Solve for x
    x = 226,037,666.59/21,160.91
  6. Step 6: Final answer
    x = 10,681.85

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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.