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Finding the Fourth Proportional to 157,230.72, 216,979.56 and 85,611.94

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Solution

The fourth proportional to 157,230.72, 216,979.56 and 85,611.94 is: 118,145.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    157,230.72 : 216,979.56 = 85,611.94 : x
  2. Step 2: Convert to fraction form
    157,230.72/216,979.56 = 85,611.94/x
  3. Step 3: Cross multiply
    157,230.72x = 216,979.56 × 85,611.94
  4. Step 4: Simplify right side
    157,230.72x = 18,576,040,529.50
  5. Step 5: Solve for x
    x = 18,576,040,529.50/157,230.72
  6. Step 6: Final answer
    x = 118,145.11

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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.