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Finding the Fourth Proportional to 618.17, 852.06 and 438.78

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Solution

The fourth proportional to 618.17, 852.06 and 438.78 is: 604.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.17 : 852.06 = 438.78 : x
  2. Step 2: Convert to fraction form
    618.17/852.06 = 438.78/x
  3. Step 3: Cross multiply
    618.17x = 852.06 × 438.78
  4. Step 4: Simplify right side
    618.17x = 373,866.89
  5. Step 5: Solve for x
    x = 373,866.89/618.17
  6. Step 6: Final answer
    x = 604.80

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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.