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Finding the Fourth Proportional to 121,871.90, 168,182.04 and 68,156.30

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Solution

The fourth proportional to 121,871.90, 168,182.04 and 68,156.30 is: 94,055.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,871.90 : 168,182.04 = 68,156.30 : x
  2. Step 2: Convert to fraction form
    121,871.90/168,182.04 = 68,156.30/x
  3. Step 3: Cross multiply
    121,871.90x = 168,182.04 × 68,156.30
  4. Step 4: Simplify right side
    121,871.90x = 11,462,665,572.85
  5. Step 5: Solve for x
    x = 11,462,665,572.85/121,871.90
  6. Step 6: Final answer
    x = 94,055.03

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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.