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Finding the Fourth Proportional to 990.72, 1,366.80 and 866.39

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Solution

The fourth proportional to 990.72, 1,366.80 and 866.39 is: 1,195.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.72 : 1,366.80 = 866.39 : x
  2. Step 2: Convert to fraction form
    990.72/1,366.80 = 866.39/x
  3. Step 3: Cross multiply
    990.72x = 1,366.80 × 866.39
  4. Step 4: Simplify right side
    990.72x = 1,184,175.02
  5. Step 5: Solve for x
    x = 1,184,175.02/990.72
  6. Step 6: Final answer
    x = 1,195.27

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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.