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Finding the Fourth Proportional to 139,027.40, 208,541.10 and 86,409.80

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Solution

The fourth proportional to 139,027.40, 208,541.10 and 86,409.80 is: 129,614.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,027.40 : 208,541.10 = 86,409.80 : x
  2. Step 2: Convert to fraction form
    139,027.40/208,541.10 = 86,409.80/x
  3. Step 3: Cross multiply
    139,027.40x = 208,541.10 × 86,409.80
  4. Step 4: Simplify right side
    139,027.40x = 18,019,994,742.78
  5. Step 5: Solve for x
    x = 18,019,994,742.78/139,027.40
  6. Step 6: Final answer
    x = 129,614.70

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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.