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Finding the Fourth Proportional to 156,631.86, 216,152.16 and 85,011.88

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Solution

The fourth proportional to 156,631.86, 216,152.16 and 85,011.88 is: 117,316.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,631.86 : 216,152.16 = 85,011.88 : x
  2. Step 2: Convert to fraction form
    156,631.86/216,152.16 = 85,011.88/x
  3. Step 3: Cross multiply
    156,631.86x = 216,152.16 × 85,011.88
  4. Step 4: Simplify right side
    156,631.86x = 18,375,501,487.66
  5. Step 5: Solve for x
    x = 18,375,501,487.66/156,631.86
  6. Step 6: Final answer
    x = 117,316.50

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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.