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Finding the Fourth Proportional to 129,903, 179,246.90 and 78,889.14

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Solution

The fourth proportional to 129,903, 179,246.90 and 78,889.14 is: 108,855.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,903 : 179,246.90 = 78,889.14 : x
  2. Step 2: Convert to fraction form
    129,903/179,246.90 = 78,889.14/x
  3. Step 3: Cross multiply
    129,903x = 179,246.90 × 78,889.14
  4. Step 4: Simplify right side
    129,903x = 14,140,633,788.67
  5. Step 5: Solve for x
    x = 14,140,633,788.67/129,903
  6. Step 6: Final answer
    x = 108,855.33

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1.5x scale

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.