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Finding the Fourth Proportional to 156,435.76, 215,879.34 and 84,815.56

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Solution

The fourth proportional to 156,435.76, 215,879.34 and 84,815.56 is: 117,044.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,435.76 : 215,879.34 = 84,815.56 : x
  2. Step 2: Convert to fraction form
    156,435.76/215,879.34 = 84,815.56/x
  3. Step 3: Cross multiply
    156,435.76x = 215,879.34 × 84,815.56
  4. Step 4: Simplify right side
    156,435.76x = 18,309,927,114.53
  5. Step 5: Solve for x
    x = 18,309,927,114.53/156,435.76
  6. Step 6: Final answer
    x = 117,044.38

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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.