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Finding the Fourth Proportional to 1,190.67, 1,643.17 and 666.70

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Solution

The fourth proportional to 1,190.67, 1,643.17 and 666.70 is: 920.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.67 : 1,643.17 = 666.70 : x
  2. Step 2: Convert to fraction form
    1,190.67/1,643.17 = 666.70/x
  3. Step 3: Cross multiply
    1,190.67x = 1,643.17 × 666.70
  4. Step 4: Simplify right side
    1,190.67x = 1,095,489.89
  5. Step 5: Solve for x
    x = 1,095,489.89/1,190.67
  6. Step 6: Final answer
    x = 920.07

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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.