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Finding the Fourth Proportional to 662.99, 989.62 and 608.21

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Solution

The fourth proportional to 662.99, 989.62 and 608.21 is: 907.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.99 : 989.62 = 608.21 : x
  2. Step 2: Convert to fraction form
    662.99/989.62 = 608.21/x
  3. Step 3: Cross multiply
    662.99x = 989.62 × 608.21
  4. Step 4: Simplify right side
    662.99x = 601,894.02
  5. Step 5: Solve for x
    x = 601,894.02/662.99
  6. Step 6: Final answer
    x = 907.85

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.