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Finding the Fourth Proportional to 990.36, 1,366.55 and 564.99

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Solution

The fourth proportional to 990.36, 1,366.55 and 564.99 is: 779.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.36 : 1,366.55 = 564.99 : x
  2. Step 2: Convert to fraction form
    990.36/1,366.55 = 564.99/x
  3. Step 3: Cross multiply
    990.36x = 1,366.55 × 564.99
  4. Step 4: Simplify right side
    990.36x = 772,092.12
  5. Step 5: Solve for x
    x = 772,092.12/990.36
  6. Step 6: Final answer
    x = 779.61

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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.