Home / 100,878.89-139,229.51-76,960.40

Finding the Fourth Proportional to 100,878.89, 139,229.51 and 76,960.40

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Solution

The fourth proportional to 100,878.89, 139,229.51 and 76,960.40 is: 106,218.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,878.89 : 139,229.51 = 76,960.40 : x
  2. Step 2: Convert to fraction form
    100,878.89/139,229.51 = 76,960.40/x
  3. Step 3: Cross multiply
    100,878.89x = 139,229.51 × 76,960.40
  4. Step 4: Simplify right side
    100,878.89x = 10,715,157,700.45
  5. Step 5: Solve for x
    x = 10,715,157,700.45/100,878.89
  6. Step 6: Final answer
    x = 106,218.04

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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.