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Finding the Fourth Proportional to 156,611.79, 216,124.41 and 84,991.83

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Solution

The fourth proportional to 156,611.79, 216,124.41 and 84,991.83 is: 117,288.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,611.79 : 216,124.41 = 84,991.83 : x
  2. Step 2: Convert to fraction form
    156,611.79/216,124.41 = 84,991.83/x
  3. Step 3: Cross multiply
    156,611.79x = 216,124.41 × 84,991.83
  4. Step 4: Simplify right side
    156,611.79x = 18,368,809,113.57
  5. Step 5: Solve for x
    x = 18,368,809,113.57/156,611.79
  6. Step 6: Final answer
    x = 117,288.80

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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.