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Finding the Fourth Proportional to 124,866.78, 172,168.92 and 100,919.40

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Solution

The fourth proportional to 124,866.78, 172,168.92 and 100,919.40 is: 139,149.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,866.78 : 172,168.92 = 100,919.40 : x
  2. Step 2: Convert to fraction form
    124,866.78/172,168.92 = 100,919.40/x
  3. Step 3: Cross multiply
    124,866.78x = 172,168.92 × 100,919.40
  4. Step 4: Simplify right side
    124,866.78x = 17,375,184,105.05
  5. Step 5: Solve for x
    x = 17,375,184,105.05/124,866.78
  6. Step 6: Final answer
    x = 139,149.77

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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.