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Finding the Fourth Proportional to 990.69, 1,366.87 and 675.39

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Solution

The fourth proportional to 990.69, 1,366.87 and 675.39 is: 931.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.69 : 1,366.87 = 675.39 : x
  2. Step 2: Convert to fraction form
    990.69/1,366.87 = 675.39/x
  3. Step 3: Cross multiply
    990.69x = 1,366.87 × 675.39
  4. Step 4: Simplify right side
    990.69x = 923,170.33
  5. Step 5: Solve for x
    x = 923,170.33/990.69
  6. Step 6: Final answer
    x = 931.85

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1.5x scale

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.