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Finding the Fourth Proportional to 138,060.86, 207,298.65 and 78,963.26

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Solution

The fourth proportional to 138,060.86, 207,298.65 and 78,963.26 is: 118,563.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,060.86 : 207,298.65 = 78,963.26 : x
  2. Step 2: Convert to fraction form
    138,060.86/207,298.65 = 78,963.26/x
  3. Step 3: Cross multiply
    138,060.86x = 207,298.65 × 78,963.26
  4. Step 4: Simplify right side
    138,060.86x = 16,368,977,197.60
  5. Step 5: Solve for x
    x = 16,368,977,197.60/138,060.86
  6. Step 6: Final answer
    x = 118,563.49

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.