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Finding the Fourth Proportional to 159,619.40, 239,429.10 and 128,515.40

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Solution

The fourth proportional to 159,619.40, 239,429.10 and 128,515.40 is: 192,773.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    159,619.40 : 239,429.10 = 128,515.40 : x
  2. Step 2: Convert to fraction form
    159,619.40/239,429.10 = 128,515.40/x
  3. Step 3: Cross multiply
    159,619.40x = 239,429.10 × 128,515.40
  4. Step 4: Simplify right side
    159,619.40x = 30,770,326,558.14
  5. Step 5: Solve for x
    x = 30,770,326,558.14/159,619.40
  6. Step 6: Final answer
    x = 192,773.10

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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.