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Finding the Fourth Proportional to 123,485.63, 170,393.87 and 78,083.51

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Solution

The fourth proportional to 123,485.63, 170,393.87 and 78,083.51 is: 107,744.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,485.63 : 170,393.87 = 78,083.51 : x
  2. Step 2: Convert to fraction form
    123,485.63/170,393.87 = 78,083.51/x
  3. Step 3: Cross multiply
    123,485.63x = 170,393.87 × 78,083.51
  4. Step 4: Simplify right side
    123,485.63x = 13,304,951,452.08
  5. Step 5: Solve for x
    x = 13,304,951,452.08/123,485.63
  6. Step 6: Final answer
    x = 107,744.94

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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.