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Finding the Fourth Proportional to 78,141.60, 117,190.80 and 31,399.20

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Solution

The fourth proportional to 78,141.60, 117,190.80 and 31,399.20 is: 47,090.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,141.60 : 117,190.80 = 31,399.20 : x
  2. Step 2: Convert to fraction form
    78,141.60/117,190.80 = 31,399.20/x
  3. Step 3: Cross multiply
    78,141.60x = 117,190.80 × 31,399.20
  4. Step 4: Simplify right side
    78,141.60x = 3,679,697,367.36
  5. Step 5: Solve for x
    x = 3,679,697,367.36/78,141.60
  6. Step 6: Final answer
    x = 47,090.12

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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.