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Finding the Fourth Proportional to 660.68, 990.54 and 404.12

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Solution

The fourth proportional to 660.68, 990.54 and 404.12 is: 605.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.68 : 990.54 = 404.12 : x
  2. Step 2: Convert to fraction form
    660.68/990.54 = 404.12/x
  3. Step 3: Cross multiply
    660.68x = 990.54 × 404.12
  4. Step 4: Simplify right side
    660.68x = 400,297.02
  5. Step 5: Solve for x
    x = 400,297.02/660.68
  6. Step 6: Final answer
    x = 605.89

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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.