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Finding the Fourth Proportional to 679.76, 939.60 and 506.72

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Solution

The fourth proportional to 679.76, 939.60 and 506.72 is: 700.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.76 : 939.60 = 506.72 : x
  2. Step 2: Convert to fraction form
    679.76/939.60 = 506.72/x
  3. Step 3: Cross multiply
    679.76x = 939.60 × 506.72
  4. Step 4: Simplify right side
    679.76x = 476,114.11
  5. Step 5: Solve for x
    x = 476,114.11/679.76
  6. Step 6: Final answer
    x = 700.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.