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Finding the Fourth Proportional to 245,718.58, 339,091.32 and 138,289.38

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Solution

The fourth proportional to 245,718.58, 339,091.32 and 138,289.38 is: 190,839.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    245,718.58 : 339,091.32 = 138,289.38 : x
  2. Step 2: Convert to fraction form
    245,718.58/339,091.32 = 138,289.38/x
  3. Step 3: Cross multiply
    245,718.58x = 339,091.32 × 138,289.38
  4. Step 4: Simplify right side
    245,718.58x = 46,892,728,406.18
  5. Step 5: Solve for x
    x = 46,892,728,406.18/245,718.58
  6. Step 6: Final answer
    x = 190,839.16

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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.