Home / 123,823.20-170,812.08-78,424.80

Finding the Fourth Proportional to 123,823.20, 170,812.08 and 78,424.80

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Solution

The fourth proportional to 123,823.20, 170,812.08 and 78,424.80 is: 108,185.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,823.20 : 170,812.08 = 78,424.80 : x
  2. Step 2: Convert to fraction form
    123,823.20/170,812.08 = 78,424.80/x
  3. Step 3: Cross multiply
    123,823.20x = 170,812.08 × 78,424.80
  4. Step 4: Simplify right side
    123,823.20x = 13,395,903,211.58
  5. Step 5: Solve for x
    x = 13,395,903,211.58/123,823.20
  6. Step 6: Final answer
    x = 108,185.73

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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.