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Finding the Fourth Proportional to 1,203.12, 1,803.54 and 380.82

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Solution

The fourth proportional to 1,203.12, 1,803.54 and 380.82 is: 570.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,203.12 : 1,803.54 = 380.82 : x
  2. Step 2: Convert to fraction form
    1,203.12/1,803.54 = 380.82/x
  3. Step 3: Cross multiply
    1,203.12x = 1,803.54 × 380.82
  4. Step 4: Simplify right side
    1,203.12x = 686,824.10
  5. Step 5: Solve for x
    x = 686,824.10/1,203.12
  6. Step 6: Final answer
    x = 570.87

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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.