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Finding the Fourth Proportional to 448.57, 618.82 and 317.76

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Solution

The fourth proportional to 448.57, 618.82 and 317.76 is: 438.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.57 : 618.82 = 317.76 : x
  2. Step 2: Convert to fraction form
    448.57/618.82 = 317.76/x
  3. Step 3: Cross multiply
    448.57x = 618.82 × 317.76
  4. Step 4: Simplify right side
    448.57x = 196,636.24
  5. Step 5: Solve for x
    x = 196,636.24/448.57
  6. Step 6: Final answer
    x = 438.36

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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.