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Finding the Fourth Proportional to 618.10, 852.12 and 505.68

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Solution

The fourth proportional to 618.10, 852.12 and 505.68 is: 697.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.10 : 852.12 = 505.68 : x
  2. Step 2: Convert to fraction form
    618.10/852.12 = 505.68/x
  3. Step 3: Cross multiply
    618.10x = 852.12 × 505.68
  4. Step 4: Simplify right side
    618.10x = 430,896.85
  5. Step 5: Solve for x
    x = 430,896.85/618.10
  6. Step 6: Final answer
    x = 697.13

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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.