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Finding the Fourth Proportional to 1,190.99, 1,643.48 and 666.95

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Solution

The fourth proportional to 1,190.99, 1,643.48 and 666.95 is: 920.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.99 : 1,643.48 = 666.95 : x
  2. Step 2: Convert to fraction form
    1,190.99/1,643.48 = 666.95/x
  3. Step 3: Cross multiply
    1,190.99x = 1,643.48 × 666.95
  4. Step 4: Simplify right side
    1,190.99x = 1,096,115.65
  5. Step 5: Solve for x
    x = 1,096,115.65/1,190.99
  6. Step 6: Final answer
    x = 920.34

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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.