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Finding the Fourth Proportional to 79,995.22, 119,999.72 and 20,831.00

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Solution

The fourth proportional to 79,995.22, 119,999.72 and 20,831.00 is: 31,248.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,995.22 : 119,999.72 = 20,831.00 : x
  2. Step 2: Convert to fraction form
    79,995.22/119,999.72 = 20,831.00/x
  3. Step 3: Cross multiply
    79,995.22x = 119,999.72 × 20,831.00
  4. Step 4: Simplify right side
    79,995.22x = 2,499,714,069.40
  5. Step 5: Solve for x
    x = 2,499,714,069.40/79,995.22
  6. Step 6: Final answer
    x = 31,248.29

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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.