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Finding the Fourth Proportional to 990.27, 1,365.75 and 675

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Solution

The fourth proportional to 990.27, 1,365.75 and 675 is: 930.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.27 : 1,365.75 = 675 : x
  2. Step 2: Convert to fraction form
    990.27/1,365.75 = 675/x
  3. Step 3: Cross multiply
    990.27x = 1,365.75 × 675
  4. Step 4: Simplify right side
    990.27x = 921,881.25
  5. Step 5: Solve for x
    x = 921,881.25/990.27
  6. Step 6: Final answer
    x = 930.94

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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.