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Finding the Fourth Proportional to 78,650.55, 117,381.63 and 73,317.68

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Solution

The fourth proportional to 78,650.55, 117,381.63 and 73,317.68 is: 109,422.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,650.55 : 117,381.63 = 73,317.68 : x
  2. Step 2: Convert to fraction form
    78,650.55/117,381.63 = 73,317.68/x
  3. Step 3: Cross multiply
    78,650.55x = 117,381.63 × 73,317.68
  4. Step 4: Simplify right side
    78,650.55x = 8,606,149,079.67
  5. Step 5: Solve for x
    x = 8,606,149,079.67/78,650.55
  6. Step 6: Final answer
    x = 109,422.62

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.