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Finding the Fourth Proportional to 109,619.40, 164,429.10 and 79,730.40

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Solution

The fourth proportional to 109,619.40, 164,429.10 and 79,730.40 is: 119,595.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,619.40 : 164,429.10 = 79,730.40 : x
  2. Step 2: Convert to fraction form
    109,619.40/164,429.10 = 79,730.40/x
  3. Step 3: Cross multiply
    109,619.40x = 164,429.10 × 79,730.40
  4. Step 4: Simplify right side
    109,619.40x = 13,109,997,914.64
  5. Step 5: Solve for x
    x = 13,109,997,914.64/109,619.40
  6. Step 6: Final answer
    x = 119,595.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.