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Finding the Fourth Proportional to 666.20, 918.80 and 417.06

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Solution

The fourth proportional to 666.20, 918.80 and 417.06 is: 575.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.20 : 918.80 = 417.06 : x
  2. Step 2: Convert to fraction form
    666.20/918.80 = 417.06/x
  3. Step 3: Cross multiply
    666.20x = 918.80 × 417.06
  4. Step 4: Simplify right side
    666.20x = 383,194.73
  5. Step 5: Solve for x
    x = 383,194.73/666.20
  6. Step 6: Final answer
    x = 575.19

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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.