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Finding the Fourth Proportional to 943.38, 1,415.05 and 285.26

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Solution

The fourth proportional to 943.38, 1,415.05 and 285.26 is: 427.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    943.38 : 1,415.05 = 285.26 : x
  2. Step 2: Convert to fraction form
    943.38/1,415.05 = 285.26/x
  3. Step 3: Cross multiply
    943.38x = 1,415.05 × 285.26
  4. Step 4: Simplify right side
    943.38x = 403,657.16
  5. Step 5: Solve for x
    x = 403,657.16/943.38
  6. Step 6: Final answer
    x = 427.88

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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.