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Finding the Fourth Proportional to 92,958.10, 128,531.01 and 81,148.30

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Solution

The fourth proportional to 92,958.10, 128,531.01 and 81,148.30 is: 112,201.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,958.10 : 128,531.01 = 81,148.30 : x
  2. Step 2: Convert to fraction form
    92,958.10/128,531.01 = 81,148.30/x
  3. Step 3: Cross multiply
    92,958.10x = 128,531.01 × 81,148.30
  4. Step 4: Simplify right side
    92,958.10x = 10,430,072,958.78
  5. Step 5: Solve for x
    x = 10,430,072,958.78/92,958.10
  6. Step 6: Final answer
    x = 112,201.87

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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.