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Finding the Fourth Proportional to 654.24, 903.46 and 421.78

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Solution

The fourth proportional to 654.24, 903.46 and 421.78 is: 582.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.24 : 903.46 = 421.78 : x
  2. Step 2: Convert to fraction form
    654.24/903.46 = 421.78/x
  3. Step 3: Cross multiply
    654.24x = 903.46 × 421.78
  4. Step 4: Simplify right side
    654.24x = 381,061.36
  5. Step 5: Solve for x
    x = 381,061.36/654.24
  6. Step 6: Final answer
    x = 582.45

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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.