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Finding the Fourth Proportional to 92,958.48, 128,387.16 and 71,991.36

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Solution

The fourth proportional to 92,958.48, 128,387.16 and 71,991.36 is: 99,428.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,958.48 : 128,387.16 = 71,991.36 : x
  2. Step 2: Convert to fraction form
    92,958.48/128,387.16 = 71,991.36/x
  3. Step 3: Cross multiply
    92,958.48x = 128,387.16 × 71,991.36
  4. Step 4: Simplify right side
    92,958.48x = 9,242,766,254.94
  5. Step 5: Solve for x
    x = 9,242,766,254.94/92,958.48
  6. Step 6: Final answer
    x = 99,428.97

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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.