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Finding the Fourth Proportional to 666.36, 993.67 and 620.19

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Solution

The fourth proportional to 666.36, 993.67 and 620.19 is: 924.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.36 : 993.67 = 620.19 : x
  2. Step 2: Convert to fraction form
    666.36/993.67 = 620.19/x
  3. Step 3: Cross multiply
    666.36x = 993.67 × 620.19
  4. Step 4: Simplify right side
    666.36x = 616,262.65
  5. Step 5: Solve for x
    x = 616,262.65/666.36
  6. Step 6: Final answer
    x = 924.82

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.