Home / 21,320.61-31,939.90-11,932.20

Finding the Fourth Proportional to 21,320.61, 31,939.90 and 11,932.20

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Solution

The fourth proportional to 21,320.61, 31,939.90 and 11,932.20 is: 17,875.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,320.61 : 31,939.90 = 11,932.20 : x
  2. Step 2: Convert to fraction form
    21,320.61/31,939.90 = 11,932.20/x
  3. Step 3: Cross multiply
    21,320.61x = 31,939.90 × 11,932.20
  4. Step 4: Simplify right side
    21,320.61x = 381,113,274.78
  5. Step 5: Solve for x
    x = 381,113,274.78/21,320.61
  6. Step 6: Final answer
    x = 17,875.35

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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.