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Finding the Fourth Proportional to 68,990.29, 103,557.80 and 61,143.01

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Solution

The fourth proportional to 68,990.29, 103,557.80 and 61,143.01 is: 91,778.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,990.29 : 103,557.80 = 61,143.01 : x
  2. Step 2: Convert to fraction form
    68,990.29/103,557.80 = 61,143.01/x
  3. Step 3: Cross multiply
    68,990.29x = 103,557.80 × 61,143.01
  4. Step 4: Simplify right side
    68,990.29x = 6,331,835,494.94
  5. Step 5: Solve for x
    x = 6,331,835,494.94/68,990.29
  6. Step 6: Final answer
    x = 91,778.65

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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.