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Finding the Fourth Proportional to 101,513.15, 139,995.05 and 87,168.09

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Solution

The fourth proportional to 101,513.15, 139,995.05 and 87,168.09 is: 120,212.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,513.15 : 139,995.05 = 87,168.09 : x
  2. Step 2: Convert to fraction form
    101,513.15/139,995.05 = 87,168.09/x
  3. Step 3: Cross multiply
    101,513.15x = 139,995.05 × 87,168.09
  4. Step 4: Simplify right side
    101,513.15x = 12,203,101,117.95
  5. Step 5: Solve for x
    x = 12,203,101,117.95/101,513.15
  6. Step 6: Final answer
    x = 120,212.02

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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.