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Finding the Fourth Proportional to 678.21, 935.58 and 468.60

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Solution

The fourth proportional to 678.21, 935.58 and 468.60 is: 646.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.21 : 935.58 = 468.60 : x
  2. Step 2: Convert to fraction form
    678.21/935.58 = 468.60/x
  3. Step 3: Cross multiply
    678.21x = 935.58 × 468.60
  4. Step 4: Simplify right side
    678.21x = 438,412.79
  5. Step 5: Solve for x
    x = 438,412.79/678.21
  6. Step 6: Final answer
    x = 646.43

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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.