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Finding the Fourth Proportional to 418.74, 627.63 and 315.69

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Solution

The fourth proportional to 418.74, 627.63 and 315.69 is: 473.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.74 : 627.63 = 315.69 : x
  2. Step 2: Convert to fraction form
    418.74/627.63 = 315.69/x
  3. Step 3: Cross multiply
    418.74x = 627.63 × 315.69
  4. Step 4: Simplify right side
    418.74x = 198,136.51
  5. Step 5: Solve for x
    x = 198,136.51/418.74
  6. Step 6: Final answer
    x = 473.17

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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.