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Finding the Fourth Proportional to 378.55, 567.02 and 305.65

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Solution

The fourth proportional to 378.55, 567.02 and 305.65 is: 457.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.55 : 567.02 = 305.65 : x
  2. Step 2: Convert to fraction form
    378.55/567.02 = 305.65/x
  3. Step 3: Cross multiply
    378.55x = 567.02 × 305.65
  4. Step 4: Simplify right side
    378.55x = 173,308.13
  5. Step 5: Solve for x
    x = 173,308.13/378.55
  6. Step 6: Final answer
    x = 457.82

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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.