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Finding the Fourth Proportional to 121,991.32, 168,309.66 and 68,267.80

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Solution

The fourth proportional to 121,991.32, 168,309.66 and 68,267.80 is: 94,188.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,991.32 : 168,309.66 = 68,267.80 : x
  2. Step 2: Convert to fraction form
    121,991.32/168,309.66 = 68,267.80/x
  3. Step 3: Cross multiply
    121,991.32x = 168,309.66 × 68,267.80
  4. Step 4: Simplify right side
    121,991.32x = 11,490,130,206.95
  5. Step 5: Solve for x
    x = 11,490,130,206.95/121,991.32
  6. Step 6: Final answer
    x = 94,188.10

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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.