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Finding the Fourth Proportional to 425.21, 640.19 and 374.18

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Solution

The fourth proportional to 425.21, 640.19 and 374.18 is: 563.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.21 : 640.19 = 374.18 : x
  2. Step 2: Convert to fraction form
    425.21/640.19 = 374.18/x
  3. Step 3: Cross multiply
    425.21x = 640.19 × 374.18
  4. Step 4: Simplify right side
    425.21x = 239,544.03
  5. Step 5: Solve for x
    x = 239,544.03/425.21
  6. Step 6: Final answer
    x = 563.36

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.