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Finding the Fourth Proportional to 245,889.62, 339,318.55 and 136,991.40

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Solution

The fourth proportional to 245,889.62, 339,318.55 and 136,991.40 is: 189,043.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    245,889.62 : 339,318.55 = 136,991.40 : x
  2. Step 2: Convert to fraction form
    245,889.62/339,318.55 = 136,991.40/x
  3. Step 3: Cross multiply
    245,889.62x = 339,318.55 × 136,991.40
  4. Step 4: Simplify right side
    245,889.62x = 46,483,723,210.47
  5. Step 5: Solve for x
    x = 46,483,723,210.47/245,889.62
  6. Step 6: Final answer
    x = 189,043.05

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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.