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Finding the Fourth Proportional to 137,316.87, 205,778.48 and 78,027.30

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Solution

The fourth proportional to 137,316.87, 205,778.48 and 78,027.30 is: 116,929.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,316.87 : 205,778.48 = 78,027.30 : x
  2. Step 2: Convert to fraction form
    137,316.87/205,778.48 = 78,027.30/x
  3. Step 3: Cross multiply
    137,316.87x = 205,778.48 × 78,027.30
  4. Step 4: Simplify right side
    137,316.87x = 16,056,338,802.37
  5. Step 5: Solve for x
    x = 16,056,338,802.37/137,316.87
  6. Step 6: Final answer
    x = 116,929.11

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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.