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Finding the Fourth Proportional to 466.49, 643.21 and 387.89

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Solution

The fourth proportional to 466.49, 643.21 and 387.89 is: 534.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    466.49 : 643.21 = 387.89 : x
  2. Step 2: Convert to fraction form
    466.49/643.21 = 387.89/x
  3. Step 3: Cross multiply
    466.49x = 643.21 × 387.89
  4. Step 4: Simplify right side
    466.49x = 249,495.37
  5. Step 5: Solve for x
    x = 249,495.37/466.49
  6. Step 6: Final answer
    x = 534.84

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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.