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Finding the Fourth Proportional to 1,190.58, 1,643.07 and 666.61

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Solution

The fourth proportional to 1,190.58, 1,643.07 and 666.61 is: 919.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.58 : 1,643.07 = 666.61 : x
  2. Step 2: Convert to fraction form
    1,190.58/1,643.07 = 666.61/x
  3. Step 3: Cross multiply
    1,190.58x = 1,643.07 × 666.61
  4. Step 4: Simplify right side
    1,190.58x = 1,095,285.28
  5. Step 5: Solve for x
    x = 1,095,285.28/1,190.58
  6. Step 6: Final answer
    x = 919.96

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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.