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Finding the Fourth Proportional to 156,748.76, 216,313.91 and 85,129.98

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Solution

The fourth proportional to 156,748.76, 216,313.91 and 85,129.98 is: 117,479.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,748.76 : 216,313.91 = 85,129.98 : x
  2. Step 2: Convert to fraction form
    156,748.76/216,313.91 = 85,129.98/x
  3. Step 3: Cross multiply
    156,748.76x = 216,313.91 × 85,129.98
  4. Step 4: Simplify right side
    156,748.76x = 18,414,798,832.02
  5. Step 5: Solve for x
    x = 18,414,798,832.02/156,748.76
  6. Step 6: Final answer
    x = 117,479.71

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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.