Home / 78,099.12-117,156.56-21,939.36

Finding the Fourth Proportional to 78,099.12, 117,156.56 and 21,939.36

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Solution

The fourth proportional to 78,099.12, 117,156.56 and 21,939.36 is: 32,911.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,099.12 : 117,156.56 = 21,939.36 : x
  2. Step 2: Convert to fraction form
    78,099.12/117,156.56 = 21,939.36/x
  3. Step 3: Cross multiply
    78,099.12x = 117,156.56 × 21,939.36
  4. Step 4: Simplify right side
    78,099.12x = 2,570,339,946.20
  5. Step 5: Solve for x
    x = 2,570,339,946.20/78,099.12
  6. Step 6: Final answer
    x = 32,911.25

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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.