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Finding the Fourth Proportional to 317.58, 476.64 and 257.46

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Solution

The fourth proportional to 317.58, 476.64 and 257.46 is: 386.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.58 : 476.64 = 257.46 : x
  2. Step 2: Convert to fraction form
    317.58/476.64 = 257.46/x
  3. Step 3: Cross multiply
    317.58x = 476.64 × 257.46
  4. Step 4: Simplify right side
    317.58x = 122,715.73
  5. Step 5: Solve for x
    x = 122,715.73/317.58
  6. Step 6: Final answer
    x = 386.41

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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.