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Finding the Fourth Proportional to 1,191.02, 1,643.63 and 667.02

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Solution

The fourth proportional to 1,191.02, 1,643.63 and 667.02 is: 920.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.02 : 1,643.63 = 667.02 : x
  2. Step 2: Convert to fraction form
    1,191.02/1,643.63 = 667.02/x
  3. Step 3: Cross multiply
    1,191.02x = 1,643.63 × 667.02
  4. Step 4: Simplify right side
    1,191.02x = 1,096,334.08
  5. Step 5: Solve for x
    x = 1,096,334.08/1,191.02
  6. Step 6: Final answer
    x = 920.50

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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.