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Finding the Fourth Proportional to 666.53, 919.79 and 417.98

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Solution

The fourth proportional to 666.53, 919.79 and 417.98 is: 576.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.53 : 919.79 = 417.98 : x
  2. Step 2: Convert to fraction form
    666.53/919.79 = 417.98/x
  3. Step 3: Cross multiply
    666.53x = 919.79 × 417.98
  4. Step 4: Simplify right side
    666.53x = 384,447.14
  5. Step 5: Solve for x
    x = 384,447.14/666.53
  6. Step 6: Final answer
    x = 576.79

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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.