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Finding the Fourth Proportional to 122,688.78, 169,302.84 and 68,973.12

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Solution

The fourth proportional to 122,688.78, 169,302.84 and 68,973.12 is: 95,178.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,688.78 : 169,302.84 = 68,973.12 : x
  2. Step 2: Convert to fraction form
    122,688.78/169,302.84 = 68,973.12/x
  3. Step 3: Cross multiply
    122,688.78x = 169,302.84 × 68,973.12
  4. Step 4: Simplify right side
    122,688.78x = 11,677,345,099.66
  5. Step 5: Solve for x
    x = 11,677,345,099.66/122,688.78
  6. Step 6: Final answer
    x = 95,178.59

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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.