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Finding the Fourth Proportional to 1,191.10, 1,643.80 and 667.10

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Solution

The fourth proportional to 1,191.10, 1,643.80 and 667.10 is: 920.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.10 : 1,643.80 = 667.10 : x
  2. Step 2: Convert to fraction form
    1,191.10/1,643.80 = 667.10/x
  3. Step 3: Cross multiply
    1,191.10x = 1,643.80 × 667.10
  4. Step 4: Simplify right side
    1,191.10x = 1,096,578.98
  5. Step 5: Solve for x
    x = 1,096,578.98/1,191.10
  6. Step 6: Final answer
    x = 920.64

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Double scale
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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.