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Finding the Fourth Proportional to 448.21, 618.22 and 315.71

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Solution

The fourth proportional to 448.21, 618.22 and 315.71 is: 435.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.21 : 618.22 = 315.71 : x
  2. Step 2: Convert to fraction form
    448.21/618.22 = 315.71/x
  3. Step 3: Cross multiply
    448.21x = 618.22 × 315.71
  4. Step 4: Simplify right side
    448.21x = 195,178.24
  5. Step 5: Solve for x
    x = 195,178.24/448.21
  6. Step 6: Final answer
    x = 435.46

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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.