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Finding the Fourth Proportional to 121,745.78, 168,005.95 and 68,031.24

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Solution

The fourth proportional to 121,745.78, 168,005.95 and 68,031.24 is: 93,881.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,745.78 : 168,005.95 = 68,031.24 : x
  2. Step 2: Convert to fraction form
    121,745.78/168,005.95 = 68,031.24/x
  3. Step 3: Cross multiply
    121,745.78x = 168,005.95 × 68,031.24
  4. Step 4: Simplify right side
    121,745.78x = 11,429,653,105.88
  5. Step 5: Solve for x
    x = 11,429,653,105.88/121,745.78
  6. Step 6: Final answer
    x = 93,881.31

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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.