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Finding the Fourth Proportional to 937.05, 1,405.10 and 287.70

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Solution

The fourth proportional to 937.05, 1,405.10 and 287.70 is: 431.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    937.05 : 1,405.10 = 287.70 : x
  2. Step 2: Convert to fraction form
    937.05/1,405.10 = 287.70/x
  3. Step 3: Cross multiply
    937.05x = 1,405.10 × 287.70
  4. Step 4: Simplify right side
    937.05x = 404,245.83
  5. Step 5: Solve for x
    x = 404,245.83/937.05
  6. Step 6: Final answer
    x = 431.40

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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.