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Finding the Fourth Proportional to 138,647.80, 191,357.50 and 78,235.56

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Solution

The fourth proportional to 138,647.80, 191,357.50 and 78,235.56 is: 107,978.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,647.80 : 191,357.50 = 78,235.56 : x
  2. Step 2: Convert to fraction form
    138,647.80/191,357.50 = 78,235.56/x
  3. Step 3: Cross multiply
    138,647.80x = 191,357.50 × 78,235.56
  4. Step 4: Simplify right side
    138,647.80x = 14,970,961,172.70
  5. Step 5: Solve for x
    x = 14,970,961,172.70/138,647.80
  6. Step 6: Final answer
    x = 107,978.35

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1.5x scale

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.