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Finding the Fourth Proportional to 245,720.89, 339,105.74 and 138,297.88

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Solution

The fourth proportional to 245,720.89, 339,105.74 and 138,297.88 is: 190,857.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    245,720.89 : 339,105.74 = 138,297.88 : x
  2. Step 2: Convert to fraction form
    245,720.89/339,105.74 = 138,297.88/x
  3. Step 3: Cross multiply
    245,720.89x = 339,105.74 × 138,297.88
  4. Step 4: Simplify right side
    245,720.89x = 46,897,604,937.83
  5. Step 5: Solve for x
    x = 46,897,604,937.83/245,720.89
  6. Step 6: Final answer
    x = 190,857.22

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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.