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Finding the Fourth Proportional to 679.53, 942.06 and 644.40

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Solution

The fourth proportional to 679.53, 942.06 and 644.40 is: 893.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.53 : 942.06 = 644.40 : x
  2. Step 2: Convert to fraction form
    679.53/942.06 = 644.40/x
  3. Step 3: Cross multiply
    679.53x = 942.06 × 644.40
  4. Step 4: Simplify right side
    679.53x = 607,063.46
  5. Step 5: Solve for x
    x = 607,063.46/679.53
  6. Step 6: Final answer
    x = 893.36

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.