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Finding the Fourth Proportional to 129,789, 178,946.55 and 108,309.69

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Solution

The fourth proportional to 129,789, 178,946.55 and 108,309.69 is: 149,331.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,789 : 178,946.55 = 108,309.69 : x
  2. Step 2: Convert to fraction form
    129,789/178,946.55 = 108,309.69/x
  3. Step 3: Cross multiply
    129,789x = 178,946.55 × 108,309.69
  4. Step 4: Simplify right side
    129,789x = 19,381,645,357.07
  5. Step 5: Solve for x
    x = 19,381,645,357.07/129,789
  6. Step 6: Final answer
    x = 149,331.96

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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.