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Finding the Fourth Proportional to 678.68, 935.88 and 609.80

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Solution

The fourth proportional to 678.68, 935.88 and 609.80 is: 840.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.68 : 935.88 = 609.80 : x
  2. Step 2: Convert to fraction form
    678.68/935.88 = 609.80/x
  3. Step 3: Cross multiply
    678.68x = 935.88 × 609.80
  4. Step 4: Simplify right side
    678.68x = 570,699.62
  5. Step 5: Solve for x
    x = 570,699.62/678.68
  6. Step 6: Final answer
    x = 840.90

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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.