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Finding the Fourth Proportional to 718.34, 1,076.85 and 285.39

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Solution

The fourth proportional to 718.34, 1,076.85 and 285.39 is: 427.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.34 : 1,076.85 = 285.39 : x
  2. Step 2: Convert to fraction form
    718.34/1,076.85 = 285.39/x
  3. Step 3: Cross multiply
    718.34x = 1,076.85 × 285.39
  4. Step 4: Simplify right side
    718.34x = 307,322.22
  5. Step 5: Solve for x
    x = 307,322.22/718.34
  6. Step 6: Final answer
    x = 427.83

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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.