Home / 78,039.18-117,079.02-21,879.45

Finding the Fourth Proportional to 78,039.18, 117,079.02 and 21,879.45

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Solution

The fourth proportional to 78,039.18, 117,079.02 and 21,879.45 is: 32,824.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,039.18 : 117,079.02 = 21,879.45 : x
  2. Step 2: Convert to fraction form
    78,039.18/117,079.02 = 21,879.45/x
  3. Step 3: Cross multiply
    78,039.18x = 117,079.02 × 21,879.45
  4. Step 4: Simplify right side
    78,039.18x = 2,561,624,564.14
  5. Step 5: Solve for x
    x = 2,561,624,564.14/78,039.18
  6. Step 6: Final answer
    x = 32,824.85

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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.