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Finding the Fourth Proportional to 77,888.39, 107,485.79 and 42,078.29

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Solution

The fourth proportional to 77,888.39, 107,485.79 and 42,078.29 is: 58,067.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,888.39 : 107,485.79 = 42,078.29 : x
  2. Step 2: Convert to fraction form
    77,888.39/107,485.79 = 42,078.29/x
  3. Step 3: Cross multiply
    77,888.39x = 107,485.79 × 42,078.29
  4. Step 4: Simplify right side
    77,888.39x = 4,522,817,494.68
  5. Step 5: Solve for x
    x = 4,522,817,494.68/77,888.39
  6. Step 6: Final answer
    x = 58,067.93

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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.