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Finding the Fourth Proportional to 990.85, 1,366.48 and 636.37

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Solution

The fourth proportional to 990.85, 1,366.48 and 636.37 is: 877.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.85 : 1,366.48 = 636.37 : x
  2. Step 2: Convert to fraction form
    990.85/1,366.48 = 636.37/x
  3. Step 3: Cross multiply
    990.85x = 1,366.48 × 636.37
  4. Step 4: Simplify right side
    990.85x = 869,586.88
  5. Step 5: Solve for x
    x = 869,586.88/990.85
  6. Step 6: Final answer
    x = 877.62

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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.