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Finding the Fourth Proportional to 618, 852.90 and 385.08

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Solution

The fourth proportional to 618, 852.90 and 385.08 is: 531.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    618 : 852.90 = 385.08 : x
  2. Step 2: Convert to fraction form
    618/852.90 = 385.08/x
  3. Step 3: Cross multiply
    618x = 852.90 × 385.08
  4. Step 4: Simplify right side
    618x = 328,434.73
  5. Step 5: Solve for x
    x = 328,434.73/618
  6. Step 6: Final answer
    x = 531.45

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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.