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Finding the Fourth Proportional to 92,990.31, 128,379.38 and 71,145.53

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Solution

The fourth proportional to 92,990.31, 128,379.38 and 71,145.53 is: 98,221.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,990.31 : 128,379.38 = 71,145.53 : x
  2. Step 2: Convert to fraction form
    92,990.31/128,379.38 = 71,145.53/x
  3. Step 3: Cross multiply
    92,990.31x = 128,379.38 × 71,145.53
  4. Step 4: Simplify right side
    92,990.31x = 9,133,618,033.55
  5. Step 5: Solve for x
    x = 9,133,618,033.55/92,990.31
  6. Step 6: Final answer
    x = 98,221.18

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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.