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Finding the Fourth Proportional to 1,213.74, 1,819.65 and 483.50

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Solution

The fourth proportional to 1,213.74, 1,819.65 and 483.50 is: 724.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.74 : 1,819.65 = 483.50 : x
  2. Step 2: Convert to fraction form
    1,213.74/1,819.65 = 483.50/x
  3. Step 3: Cross multiply
    1,213.74x = 1,819.65 × 483.50
  4. Step 4: Simplify right side
    1,213.74x = 879,800.78
  5. Step 5: Solve for x
    x = 879,800.78/1,213.74
  6. Step 6: Final answer
    x = 724.87

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Half scale
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Double scale
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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.