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Finding the Fourth Proportional to 670.31, 1,005.21 and 231.44

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Solution

The fourth proportional to 670.31, 1,005.21 and 231.44 is: 347.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.31 : 1,005.21 = 231.44 : x
  2. Step 2: Convert to fraction form
    670.31/1,005.21 = 231.44/x
  3. Step 3: Cross multiply
    670.31x = 1,005.21 × 231.44
  4. Step 4: Simplify right side
    670.31x = 232,649.57
  5. Step 5: Solve for x
    x = 232,649.57/670.31
  6. Step 6: Final answer
    x = 347.08

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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.