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Finding the Fourth Proportional to 78,695.20, 108,598.96 and 45,172

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Solution

The fourth proportional to 78,695.20, 108,598.96 and 45,172 is: 62,337.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,695.20 : 108,598.96 = 45,172 : x
  2. Step 2: Convert to fraction form
    78,695.20/108,598.96 = 45,172/x
  3. Step 3: Cross multiply
    78,695.20x = 108,598.96 × 45,172
  4. Step 4: Simplify right side
    78,695.20x = 4,905,632,221.12
  5. Step 5: Solve for x
    x = 4,905,632,221.12/78,695.20
  6. Step 6: Final answer
    x = 62,337.12

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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.