Home / 21,320.32-31,766.12-20,128

Finding the Fourth Proportional to 21,320.32, 31,766.12 and 20,128

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Solution

The fourth proportional to 21,320.32, 31,766.12 and 20,128 is: 29,989.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,320.32 : 31,766.12 = 20,128 : x
  2. Step 2: Convert to fraction form
    21,320.32/31,766.12 = 20,128/x
  3. Step 3: Cross multiply
    21,320.32x = 31,766.12 × 20,128
  4. Step 4: Simplify right side
    21,320.32x = 639,388,463.36
  5. Step 5: Solve for x
    x = 639,388,463.36/21,320.32
  6. Step 6: Final answer
    x = 29,989.63

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.