Home / 123,989.78-171,137.28-76,285.85

Finding the Fourth Proportional to 123,989.78, 171,137.28 and 76,285.85

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Solution

The fourth proportional to 123,989.78, 171,137.28 and 76,285.85 is: 105,293.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,989.78 : 171,137.28 = 76,285.85 : x
  2. Step 2: Convert to fraction form
    123,989.78/171,137.28 = 76,285.85/x
  3. Step 3: Cross multiply
    123,989.78x = 171,137.28 × 76,285.85
  4. Step 4: Simplify right side
    123,989.78x = 13,055,352,015.80
  5. Step 5: Solve for x
    x = 13,055,352,015.80/123,989.78
  6. Step 6: Final answer
    x = 105,293.77

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1.5x scale

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.