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Finding the Fourth Proportional to 245,681.30, 339,039.12 and 138,253.13

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Solution

The fourth proportional to 245,681.30, 339,039.12 and 138,253.13 is: 190,788.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    245,681.30 : 339,039.12 = 138,253.13 : x
  2. Step 2: Convert to fraction form
    245,681.30/339,039.12 = 138,253.13/x
  3. Step 3: Cross multiply
    245,681.30x = 339,039.12 × 138,253.13
  4. Step 4: Simplify right side
    245,681.30x = 46,873,218,849.42
  5. Step 5: Solve for x
    x = 46,873,218,849.42/245,681.30
  6. Step 6: Final answer
    x = 190,788.71

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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.