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Finding the Fourth Proportional to 139,570.20, 209,232.78 and 55,389.78

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Solution

The fourth proportional to 139,570.20, 209,232.78 and 55,389.78 is: 83,036.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,570.20 : 209,232.78 = 55,389.78 : x
  2. Step 2: Convert to fraction form
    139,570.20/209,232.78 = 55,389.78/x
  3. Step 3: Cross multiply
    139,570.20x = 209,232.78 × 55,389.78
  4. Step 4: Simplify right side
    139,570.20x = 11,589,357,652.99
  5. Step 5: Solve for x
    x = 11,589,357,652.99/139,570.20
  6. Step 6: Final answer
    x = 83,036.05

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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.