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Finding the Fourth Proportional to 454.89, 627.64 and 289.05

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Solution

The fourth proportional to 454.89, 627.64 and 289.05 is: 398.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    454.89 : 627.64 = 289.05 : x
  2. Step 2: Convert to fraction form
    454.89/627.64 = 289.05/x
  3. Step 3: Cross multiply
    454.89x = 627.64 × 289.05
  4. Step 4: Simplify right side
    454.89x = 181,419.34
  5. Step 5: Solve for x
    x = 181,419.34/454.89
  6. Step 6: Final answer
    x = 398.82

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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.