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Finding the Fourth Proportional to 109,716.60, 151,400.70 and 61,969.80

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Solution

The fourth proportional to 109,716.60, 151,400.70 and 61,969.80 is: 85,513.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,716.60 : 151,400.70 = 61,969.80 : x
  2. Step 2: Convert to fraction form
    109,716.60/151,400.70 = 61,969.80/x
  3. Step 3: Cross multiply
    109,716.60x = 151,400.70 × 61,969.80
  4. Step 4: Simplify right side
    109,716.60x = 9,382,271,098.86
  5. Step 5: Solve for x
    x = 9,382,271,098.86/109,716.60
  6. Step 6: Final answer
    x = 85,513.69

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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.