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Finding the Fourth Proportional to 128,906.96, 193,436.98 and 69,741.32

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Solution

The fourth proportional to 128,906.96, 193,436.98 and 69,741.32 is: 104,653.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,906.96 : 193,436.98 = 69,741.32 : x
  2. Step 2: Convert to fraction form
    128,906.96/193,436.98 = 69,741.32/x
  3. Step 3: Cross multiply
    128,906.96x = 193,436.98 × 69,741.32
  4. Step 4: Simplify right side
    128,906.96x = 13,490,549,180.48
  5. Step 5: Solve for x
    x = 13,490,549,180.48/128,906.96
  6. Step 6: Final answer
    x = 104,653.38

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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.