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Finding the Fourth Proportional to 654.50, 903.21 and 355.74

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Solution

The fourth proportional to 654.50, 903.21 and 355.74 is: 490.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.50 : 903.21 = 355.74 : x
  2. Step 2: Convert to fraction form
    654.50/903.21 = 355.74/x
  3. Step 3: Cross multiply
    654.50x = 903.21 × 355.74
  4. Step 4: Simplify right side
    654.50x = 321,307.93
  5. Step 5: Solve for x
    x = 321,307.93/654.50
  6. Step 6: Final answer
    x = 490.92

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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.