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Finding the Fourth Proportional to 412.65, 618.67 and 355.55

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Solution

The fourth proportional to 412.65, 618.67 and 355.55 is: 533.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.65 : 618.67 = 355.55 : x
  2. Step 2: Convert to fraction form
    412.65/618.67 = 355.55/x
  3. Step 3: Cross multiply
    412.65x = 618.67 × 355.55
  4. Step 4: Simplify right side
    412.65x = 219,964.14
  5. Step 5: Solve for x
    x = 219,964.14/412.65
  6. Step 6: Final answer
    x = 533.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.