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Finding the Fourth Proportional to 990.20, 1,366.76 and 695.54

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Solution

The fourth proportional to 990.20, 1,366.76 and 695.54 is: 960.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.20 : 1,366.76 = 695.54 : x
  2. Step 2: Convert to fraction form
    990.20/1,366.76 = 695.54/x
  3. Step 3: Cross multiply
    990.20x = 1,366.76 × 695.54
  4. Step 4: Simplify right side
    990.20x = 950,636.25
  5. Step 5: Solve for x
    x = 950,636.25/990.20
  6. Step 6: Final answer
    x = 960.04

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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.