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Finding the Fourth Proportional to 714.78, 1,071.72 and 324.60

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Solution

The fourth proportional to 714.78, 1,071.72 and 324.60 is: 486.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.78 : 1,071.72 = 324.60 : x
  2. Step 2: Convert to fraction form
    714.78/1,071.72 = 324.60/x
  3. Step 3: Cross multiply
    714.78x = 1,071.72 × 324.60
  4. Step 4: Simplify right side
    714.78x = 347,880.31
  5. Step 5: Solve for x
    x = 347,880.31/714.78
  6. Step 6: Final answer
    x = 486.70

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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.