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Finding the Fourth Proportional to 121,173.21, 167,161.59 and 85,382.91

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Solution

The fourth proportional to 121,173.21, 167,161.59 and 85,382.91 is: 117,787.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,173.21 : 167,161.59 = 85,382.91 : x
  2. Step 2: Convert to fraction form
    121,173.21/167,161.59 = 85,382.91/x
  3. Step 3: Cross multiply
    121,173.21x = 167,161.59 × 85,382.91
  4. Step 4: Simplify right side
    121,173.21x = 14,272,742,994.43
  5. Step 5: Solve for x
    x = 14,272,742,994.43/121,173.21
  6. Step 6: Final answer
    x = 117,787.94

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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.