Home / 21,156.32-31,703.20-19,972.91

Finding the Fourth Proportional to 21,156.32, 31,703.20 and 19,972.91

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Solution

The fourth proportional to 21,156.32, 31,703.20 and 19,972.91 is: 29,929.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,156.32 : 31,703.20 = 19,972.91 : x
  2. Step 2: Convert to fraction form
    21,156.32/31,703.20 = 19,972.91/x
  3. Step 3: Cross multiply
    21,156.32x = 31,703.20 × 19,972.91
  4. Step 4: Simplify right side
    21,156.32x = 633,205,189.64
  5. Step 5: Solve for x
    x = 633,205,189.64/21,156.32
  6. Step 6: Final answer
    x = 29,929.83

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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.