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Finding the Fourth Proportional to 670.31, 1,005.07 and 231.41

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Solution

The fourth proportional to 670.31, 1,005.07 and 231.41 is: 346.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.31 : 1,005.07 = 231.41 : x
  2. Step 2: Convert to fraction form
    670.31/1,005.07 = 231.41/x
  3. Step 3: Cross multiply
    670.31x = 1,005.07 × 231.41
  4. Step 4: Simplify right side
    670.31x = 232,583.25
  5. Step 5: Solve for x
    x = 232,583.25/670.31
  6. Step 6: Final answer
    x = 346.98

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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.