Home / 97,811.20-146,716.80-78,128.20

Finding the Fourth Proportional to 97,811.20, 146,716.80 and 78,128.20

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Solution

The fourth proportional to 97,811.20, 146,716.80 and 78,128.20 is: 117,192.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    97,811.20 : 146,716.80 = 78,128.20 : x
  2. Step 2: Convert to fraction form
    97,811.20/146,716.80 = 78,128.20/x
  3. Step 3: Cross multiply
    97,811.20x = 146,716.80 × 78,128.20
  4. Step 4: Simplify right side
    97,811.20x = 11,462,719,493.76
  5. Step 5: Solve for x
    x = 11,462,719,493.76/97,811.20
  6. Step 6: Final answer
    x = 117,192.30

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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.