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Finding the Fourth Proportional to 189,906.40, 284,681.40 and 71,657.20

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Solution

The fourth proportional to 189,906.40, 284,681.40 and 71,657.20 is: 107,418.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,906.40 : 284,681.40 = 71,657.20 : x
  2. Step 2: Convert to fraction form
    189,906.40/284,681.40 = 71,657.20/x
  3. Step 3: Cross multiply
    189,906.40x = 284,681.40 × 71,657.20
  4. Step 4: Simplify right side
    189,906.40x = 20,399,472,016.08
  5. Step 5: Solve for x
    x = 20,399,472,016.08/189,906.40
  6. Step 6: Final answer
    x = 107,418.56

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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.