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Finding the Fourth Proportional to 666.07, 919.29 and 491.92

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Solution

The fourth proportional to 666.07, 919.29 and 491.92 is: 678.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.07 : 919.29 = 491.92 : x
  2. Step 2: Convert to fraction form
    666.07/919.29 = 491.92/x
  3. Step 3: Cross multiply
    666.07x = 919.29 × 491.92
  4. Step 4: Simplify right side
    666.07x = 452,217.14
  5. Step 5: Solve for x
    x = 452,217.14/666.07
  6. Step 6: Final answer
    x = 678.93

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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.