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Finding the Fourth Proportional to 934.39, 1,401.57 and 285.12

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Solution

The fourth proportional to 934.39, 1,401.57 and 285.12 is: 427.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.39 : 1,401.57 = 285.12 : x
  2. Step 2: Convert to fraction form
    934.39/1,401.57 = 285.12/x
  3. Step 3: Cross multiply
    934.39x = 1,401.57 × 285.12
  4. Step 4: Simplify right side
    934.39x = 399,616.17
  5. Step 5: Solve for x
    x = 399,616.17/934.39
  6. Step 6: Final answer
    x = 427.68

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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.