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Finding the Fourth Proportional to 128,878.83, 193,394.79 and 69,713.19

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Solution

The fourth proportional to 128,878.83, 193,394.79 and 69,713.19 is: 104,611.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,878.83 : 193,394.79 = 69,713.19 : x
  2. Step 2: Convert to fraction form
    128,878.83/193,394.79 = 69,713.19/x
  3. Step 3: Cross multiply
    128,878.83x = 193,394.79 × 69,713.19
  4. Step 4: Simplify right side
    128,878.83x = 13,482,167,740.28
  5. Step 5: Solve for x
    x = 13,482,167,740.28/128,878.83
  6. Step 6: Final answer
    x = 104,611.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.