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Finding the Fourth Proportional to 401.78, 554.70 and 317.54

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Solution

The fourth proportional to 401.78, 554.70 and 317.54 is: 438.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.78 : 554.70 = 317.54 : x
  2. Step 2: Convert to fraction form
    401.78/554.70 = 317.54/x
  3. Step 3: Cross multiply
    401.78x = 554.70 × 317.54
  4. Step 4: Simplify right side
    401.78x = 176,136.66
  5. Step 5: Solve for x
    x = 176,136.66/401.78
  6. Step 6: Final answer
    x = 438.40

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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.