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Finding the Fourth Proportional to 626.12, 864.18 and 419

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Solution

The fourth proportional to 626.12, 864.18 and 419 is: 578.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.12 : 864.18 = 419 : x
  2. Step 2: Convert to fraction form
    626.12/864.18 = 419/x
  3. Step 3: Cross multiply
    626.12x = 864.18 × 419
  4. Step 4: Simplify right side
    626.12x = 362,091.42
  5. Step 5: Solve for x
    x = 362,091.42/626.12
  6. Step 6: Final answer
    x = 578.31

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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.