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Finding the Fourth Proportional to 1,202.10, 1,803.12 and 380.42

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Solution

The fourth proportional to 1,202.10, 1,803.12 and 380.42 is: 570.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,202.10 : 1,803.12 = 380.42 : x
  2. Step 2: Convert to fraction form
    1,202.10/1,803.12 = 380.42/x
  3. Step 3: Cross multiply
    1,202.10x = 1,803.12 × 380.42
  4. Step 4: Simplify right side
    1,202.10x = 685,942.91
  5. Step 5: Solve for x
    x = 685,942.91/1,202.10
  6. Step 6: Final answer
    x = 570.62

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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.