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Finding the Fourth Proportional to 990.67, 1,486.81 and 698.75

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Solution

The fourth proportional to 990.67, 1,486.81 and 698.75 is: 1,048.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.67 : 1,486.81 = 698.75 : x
  2. Step 2: Convert to fraction form
    990.67/1,486.81 = 698.75/x
  3. Step 3: Cross multiply
    990.67x = 1,486.81 × 698.75
  4. Step 4: Simplify right side
    990.67x = 1,038,908.49
  5. Step 5: Solve for x
    x = 1,038,908.49/990.67
  6. Step 6: Final answer
    x = 1,048.69

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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.