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Finding the Fourth Proportional to 714.40, 985.80 and 662.16

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Solution

The fourth proportional to 714.40, 985.80 and 662.16 is: 913.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.40 : 985.80 = 662.16 : x
  2. Step 2: Convert to fraction form
    714.40/985.80 = 662.16/x
  3. Step 3: Cross multiply
    714.40x = 985.80 × 662.16
  4. Step 4: Simplify right side
    714.40x = 652,757.33
  5. Step 5: Solve for x
    x = 652,757.33/714.40
  6. Step 6: Final answer
    x = 913.71

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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.