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Finding the Fourth Proportional to 990.54, 1,367.55 and 659.25

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Solution

The fourth proportional to 990.54, 1,367.55 and 659.25 is: 910.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.54 : 1,367.55 = 659.25 : x
  2. Step 2: Convert to fraction form
    990.54/1,367.55 = 659.25/x
  3. Step 3: Cross multiply
    990.54x = 1,367.55 × 659.25
  4. Step 4: Simplify right side
    990.54x = 901,557.34
  5. Step 5: Solve for x
    x = 901,557.34/990.54
  6. Step 6: Final answer
    x = 910.17

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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.