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Finding the Fourth Proportional to 714.48, 990.62 and 675.60

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Solution

The fourth proportional to 714.48, 990.62 and 675.60 is: 936.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.48 : 990.62 = 675.60 : x
  2. Step 2: Convert to fraction form
    714.48/990.62 = 675.60/x
  3. Step 3: Cross multiply
    714.48x = 990.62 × 675.60
  4. Step 4: Simplify right side
    714.48x = 669,262.87
  5. Step 5: Solve for x
    x = 669,262.87/714.48
  6. Step 6: Final answer
    x = 936.71

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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.