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Finding the Fourth Proportional to 654.90, 903.90 and 393.06

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Solution

The fourth proportional to 654.90, 903.90 and 393.06 is: 542.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.90 : 903.90 = 393.06 : x
  2. Step 2: Convert to fraction form
    654.90/903.90 = 393.06/x
  3. Step 3: Cross multiply
    654.90x = 903.90 × 393.06
  4. Step 4: Simplify right side
    654.90x = 355,286.93
  5. Step 5: Solve for x
    x = 355,286.93/654.90
  6. Step 6: Final answer
    x = 542.51

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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.