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Finding the Fourth Proportional to 466.51, 643.58 and 289.43

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Solution

The fourth proportional to 466.51, 643.58 and 289.43 is: 399.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    466.51 : 643.58 = 289.43 : x
  2. Step 2: Convert to fraction form
    466.51/643.58 = 289.43/x
  3. Step 3: Cross multiply
    466.51x = 643.58 × 289.43
  4. Step 4: Simplify right side
    466.51x = 186,268.14
  5. Step 5: Solve for x
    x = 186,268.14/466.51
  6. Step 6: Final answer
    x = 399.28

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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.