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Finding the Fourth Proportional to 121,796.76, 168,106.64 and 74,040

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Solution

The fourth proportional to 121,796.76, 168,106.64 and 74,040 is: 102,191.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,796.76 : 168,106.64 = 74,040 : x
  2. Step 2: Convert to fraction form
    121,796.76/168,106.64 = 74,040/x
  3. Step 3: Cross multiply
    121,796.76x = 168,106.64 × 74,040
  4. Step 4: Simplify right side
    121,796.76x = 12,446,615,625.60
  5. Step 5: Solve for x
    x = 12,446,615,625.60/121,796.76
  6. Step 6: Final answer
    x = 102,191.68

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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.