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Finding the Fourth Proportional to 137,054.20, 205,581.30 and 78,005.20

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Solution

The fourth proportional to 137,054.20, 205,581.30 and 78,005.20 is: 117,007.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,054.20 : 205,581.30 = 78,005.20 : x
  2. Step 2: Convert to fraction form
    137,054.20/205,581.30 = 78,005.20/x
  3. Step 3: Cross multiply
    137,054.20x = 205,581.30 × 78,005.20
  4. Step 4: Simplify right side
    137,054.20x = 16,036,410,422.76
  5. Step 5: Solve for x
    x = 16,036,410,422.76/137,054.20
  6. Step 6: Final answer
    x = 117,007.80

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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.