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Finding the Fourth Proportional to 121,871.52, 168,175.68 and 67,420.48

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Solution

The fourth proportional to 121,871.52, 168,175.68 and 67,420.48 is: 93,036.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,871.52 : 168,175.68 = 67,420.48 : x
  2. Step 2: Convert to fraction form
    121,871.52/168,175.68 = 67,420.48/x
  3. Step 3: Cross multiply
    121,871.52x = 168,175.68 × 67,420.48
  4. Step 4: Simplify right side
    121,871.52x = 11,338,485,069.93
  5. Step 5: Solve for x
    x = 11,338,485,069.93/121,871.52
  6. Step 6: Final answer
    x = 93,036.38

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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.