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Finding the Fourth Proportional to 417.78, 626.58 and 255.51

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Solution

The fourth proportional to 417.78, 626.58 and 255.51 is: 383.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.78 : 626.58 = 255.51 : x
  2. Step 2: Convert to fraction form
    417.78/626.58 = 255.51/x
  3. Step 3: Cross multiply
    417.78x = 626.58 × 255.51
  4. Step 4: Simplify right side
    417.78x = 160,097.46
  5. Step 5: Solve for x
    x = 160,097.46/417.78
  6. Step 6: Final answer
    x = 383.21

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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.