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Finding the Fourth Proportional to 418.10, 626.63 and 315.05

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Solution

The fourth proportional to 418.10, 626.63 and 315.05 is: 472.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.10 : 626.63 = 315.05 : x
  2. Step 2: Convert to fraction form
    418.10/626.63 = 315.05/x
  3. Step 3: Cross multiply
    418.10x = 626.63 × 315.05
  4. Step 4: Simplify right side
    418.10x = 197,415.07
  5. Step 5: Solve for x
    x = 197,415.07/418.10
  6. Step 6: Final answer
    x = 472.18

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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.