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Finding the Fourth Proportional to 122,405.28, 168,916.44 and 68,688.91

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Solution

The fourth proportional to 122,405.28, 168,916.44 and 68,688.91 is: 94,789.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,405.28 : 168,916.44 = 68,688.91 : x
  2. Step 2: Convert to fraction form
    122,405.28/168,916.44 = 68,688.91/x
  3. Step 3: Cross multiply
    122,405.28x = 168,916.44 × 68,688.91
  4. Step 4: Simplify right side
    122,405.28x = 11,602,686,227.03
  5. Step 5: Solve for x
    x = 11,602,686,227.03/122,405.28
  6. Step 6: Final answer
    x = 94,789.10

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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.