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Finding the Fourth Proportional to 990.58, 1,366.59 and 696.07

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Solution

The fourth proportional to 990.58, 1,366.59 and 696.07 is: 960.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.58 : 1,366.59 = 696.07 : x
  2. Step 2: Convert to fraction form
    990.58/1,366.59 = 696.07/x
  3. Step 3: Cross multiply
    990.58x = 1,366.59 × 696.07
  4. Step 4: Simplify right side
    990.58x = 951,242.30
  5. Step 5: Solve for x
    x = 951,242.30/990.58
  6. Step 6: Final answer
    x = 960.29

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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.