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Finding the Fourth Proportional to 189,905.40, 284,679.90 and 71,656.20

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Solution

The fourth proportional to 189,905.40, 284,679.90 and 71,656.20 is: 107,417.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,905.40 : 284,679.90 = 71,656.20 : x
  2. Step 2: Convert to fraction form
    189,905.40/284,679.90 = 71,656.20/x
  3. Step 3: Cross multiply
    189,905.40x = 284,679.90 × 71,656.20
  4. Step 4: Simplify right side
    189,905.40x = 20,399,079,850.38
  5. Step 5: Solve for x
    x = 20,399,079,850.38/189,905.40
  6. Step 6: Final answer
    x = 107,417.06

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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.