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Finding the Fourth Proportional to 90,521.61, 135,871.80 and 67,953.82

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Solution

The fourth proportional to 90,521.61, 135,871.80 and 67,953.82 is: 101,997.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,521.61 : 135,871.80 = 67,953.82 : x
  2. Step 2: Convert to fraction form
    90,521.61/135,871.80 = 67,953.82/x
  3. Step 3: Cross multiply
    90,521.61x = 135,871.80 × 67,953.82
  4. Step 4: Simplify right side
    90,521.61x = 9,233,007,840.28
  5. Step 5: Solve for x
    x = 9,233,007,840.28/90,521.61
  6. Step 6: Final answer
    x = 101,997.83

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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.