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Finding the Fourth Proportional to 666.73, 919.68 and 479.87

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Solution

The fourth proportional to 666.73, 919.68 and 479.87 is: 661.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.73 : 919.68 = 479.87 : x
  2. Step 2: Convert to fraction form
    666.73/919.68 = 479.87/x
  3. Step 3: Cross multiply
    666.73x = 919.68 × 479.87
  4. Step 4: Simplify right side
    666.73x = 441,330.42
  5. Step 5: Solve for x
    x = 441,330.42/666.73
  6. Step 6: Final answer
    x = 661.93

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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.