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Finding the Fourth Proportional to 245,980.77, 339,455.34 and 138,540.75

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Solution

The fourth proportional to 245,980.77, 339,455.34 and 138,540.75 is: 191,187.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    245,980.77 : 339,455.34 = 138,540.75 : x
  2. Step 2: Convert to fraction form
    245,980.77/339,455.34 = 138,540.75/x
  3. Step 3: Cross multiply
    245,980.77x = 339,455.34 × 138,540.75
  4. Step 4: Simplify right side
    245,980.77x = 47,028,397,395.11
  5. Step 5: Solve for x
    x = 47,028,397,395.11/245,980.77
  6. Step 6: Final answer
    x = 191,187.29

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1.5x scale

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.