Home / 78,121.50-107,808.09-42,311.61

Finding the Fourth Proportional to 78,121.50, 107,808.09 and 42,311.61

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Solution

The fourth proportional to 78,121.50, 107,808.09 and 42,311.61 is: 58,390.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,121.50 : 107,808.09 = 42,311.61 : x
  2. Step 2: Convert to fraction form
    78,121.50/107,808.09 = 42,311.61/x
  3. Step 3: Cross multiply
    78,121.50x = 107,808.09 × 42,311.61
  4. Step 4: Simplify right side
    78,121.50x = 4,561,533,858.92
  5. Step 5: Solve for x
    x = 4,561,533,858.92/78,121.50
  6. Step 6: Final answer
    x = 58,390.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.