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Finding the Fourth Proportional to 339,410.15, 509,114.76 and 86,690.90

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Solution

The fourth proportional to 339,410.15, 509,114.76 and 86,690.90 is: 130,036.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,410.15 : 509,114.76 = 86,690.90 : x
  2. Step 2: Convert to fraction form
    339,410.15/509,114.76 = 86,690.90/x
  3. Step 3: Cross multiply
    339,410.15x = 509,114.76 × 86,690.90
  4. Step 4: Simplify right side
    339,410.15x = 44,135,616,747.68
  5. Step 5: Solve for x
    x = 44,135,616,747.68/339,410.15
  6. Step 6: Final answer
    x = 130,036.23

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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.