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Finding the Fourth Proportional to 138,293.18, 207,430.04 and 78,942.86

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Solution

The fourth proportional to 138,293.18, 207,430.04 and 78,942.86 is: 118,408.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,293.18 : 207,430.04 = 78,942.86 : x
  2. Step 2: Convert to fraction form
    138,293.18/207,430.04 = 78,942.86/x
  3. Step 3: Cross multiply
    138,293.18x = 207,430.04 × 78,942.86
  4. Step 4: Simplify right side
    138,293.18x = 16,375,120,607.51
  5. Step 5: Solve for x
    x = 16,375,120,607.51/138,293.18
  6. Step 6: Final answer
    x = 118,408.74

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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.