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Finding the Fourth Proportional to 425.44, 634.51 and 418.15

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Solution

The fourth proportional to 425.44, 634.51 and 418.15 is: 623.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.44 : 634.51 = 418.15 : x
  2. Step 2: Convert to fraction form
    425.44/634.51 = 418.15/x
  3. Step 3: Cross multiply
    425.44x = 634.51 × 418.15
  4. Step 4: Simplify right side
    425.44x = 265,320.36
  5. Step 5: Solve for x
    x = 265,320.36/425.44
  6. Step 6: Final answer
    x = 623.64

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.