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Finding the Fourth Proportional to 670.95, 1,005.21 and 644.22

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Solution

The fourth proportional to 670.95, 1,005.21 and 644.22 is: 965.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.95 : 1,005.21 = 644.22 : x
  2. Step 2: Convert to fraction form
    670.95/1,005.21 = 644.22/x
  3. Step 3: Cross multiply
    670.95x = 1,005.21 × 644.22
  4. Step 4: Simplify right side
    670.95x = 647,576.39
  5. Step 5: Solve for x
    x = 647,576.39/670.95
  6. Step 6: Final answer
    x = 965.16

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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.