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Finding the Fourth Proportional to 79,679.60, 109,991.88 and 56,724.24

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Solution

The fourth proportional to 79,679.60, 109,991.88 and 56,724.24 is: 78,303.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,679.60 : 109,991.88 = 56,724.24 : x
  2. Step 2: Convert to fraction form
    79,679.60/109,991.88 = 56,724.24/x
  3. Step 3: Cross multiply
    79,679.60x = 109,991.88 × 56,724.24
  4. Step 4: Simplify right side
    79,679.60x = 6,239,205,799.17
  5. Step 5: Solve for x
    x = 6,239,205,799.17/79,679.60
  6. Step 6: Final answer
    x = 78,303.68

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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.