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Finding the Fourth Proportional to 100,340.70, 150,511.05 and 76,721.10

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Solution

The fourth proportional to 100,340.70, 150,511.05 and 76,721.10 is: 115,081.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,340.70 : 150,511.05 = 76,721.10 : x
  2. Step 2: Convert to fraction form
    100,340.70/150,511.05 = 76,721.10/x
  3. Step 3: Cross multiply
    100,340.70x = 150,511.05 × 76,721.10
  4. Step 4: Simplify right side
    100,340.70x = 11,547,373,318.16
  5. Step 5: Solve for x
    x = 11,547,373,318.16/100,340.70
  6. Step 6: Final answer
    x = 115,081.65

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Similar ratio
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1.5x scale

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.