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Finding the Fourth Proportional to 665.66, 918.62 and 438.45

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Solution

The fourth proportional to 665.66, 918.62 and 438.45 is: 605.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.66 : 918.62 = 438.45 : x
  2. Step 2: Convert to fraction form
    665.66/918.62 = 438.45/x
  3. Step 3: Cross multiply
    665.66x = 918.62 × 438.45
  4. Step 4: Simplify right side
    665.66x = 402,766.75
  5. Step 5: Solve for x
    x = 402,766.75/665.66
  6. Step 6: Final answer
    x = 605.07

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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.