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Finding the Fourth Proportional to 626.63, 864.42 and 390.54

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Solution

The fourth proportional to 626.63, 864.42 and 390.54 is: 538.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.63 : 864.42 = 390.54 : x
  2. Step 2: Convert to fraction form
    626.63/864.42 = 390.54/x
  3. Step 3: Cross multiply
    626.63x = 864.42 × 390.54
  4. Step 4: Simplify right side
    626.63x = 337,590.59
  5. Step 5: Solve for x
    x = 337,590.59/626.63
  6. Step 6: Final answer
    x = 538.74

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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.