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Finding the Fourth Proportional to 419.15, 578.50 and 261.85

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Solution

The fourth proportional to 419.15, 578.50 and 261.85 is: 361.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.15 : 578.50 = 261.85 : x
  2. Step 2: Convert to fraction form
    419.15/578.50 = 261.85/x
  3. Step 3: Cross multiply
    419.15x = 578.50 × 261.85
  4. Step 4: Simplify right side
    419.15x = 151,478.12
  5. Step 5: Solve for x
    x = 151,478.12/419.15
  6. Step 6: Final answer
    x = 361.40

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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.