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Finding the Fourth Proportional to 109,407.54, 150,990.75 and 61,665.42

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Solution

The fourth proportional to 109,407.54, 150,990.75 and 61,665.42 is: 85,102.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,407.54 : 150,990.75 = 61,665.42 : x
  2. Step 2: Convert to fraction form
    109,407.54/150,990.75 = 61,665.42/x
  3. Step 3: Cross multiply
    109,407.54x = 150,990.75 × 61,665.42
  4. Step 4: Simplify right side
    109,407.54x = 9,310,908,014.87
  5. Step 5: Solve for x
    x = 9,310,908,014.87/109,407.54
  6. Step 6: Final answer
    x = 85,102.98

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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.