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Finding the Fourth Proportional to 679.25, 1,012.70 and 637.94

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Solution

The fourth proportional to 679.25, 1,012.70 and 637.94 is: 951.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.25 : 1,012.70 = 637.94 : x
  2. Step 2: Convert to fraction form
    679.25/1,012.70 = 637.94/x
  3. Step 3: Cross multiply
    679.25x = 1,012.70 × 637.94
  4. Step 4: Simplify right side
    679.25x = 646,041.84
  5. Step 5: Solve for x
    x = 646,041.84/679.25
  6. Step 6: Final answer
    x = 951.11

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.