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Finding the Fourth Proportional to 466.37, 643.39 and 289.20

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Solution

The fourth proportional to 466.37, 643.39 and 289.20 is: 398.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    466.37 : 643.39 = 289.20 : x
  2. Step 2: Convert to fraction form
    466.37/643.39 = 289.20/x
  3. Step 3: Cross multiply
    466.37x = 643.39 × 289.20
  4. Step 4: Simplify right side
    466.37x = 186,068.39
  5. Step 5: Solve for x
    x = 186,068.39/466.37
  6. Step 6: Final answer
    x = 398.98

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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.