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Finding the Fourth Proportional to 635.79, 876.59 and 486.60

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Solution

The fourth proportional to 635.79, 876.59 and 486.60 is: 670.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    635.79 : 876.59 = 486.60 : x
  2. Step 2: Convert to fraction form
    635.79/876.59 = 486.60/x
  3. Step 3: Cross multiply
    635.79x = 876.59 × 486.60
  4. Step 4: Simplify right side
    635.79x = 426,544.80
  5. Step 5: Solve for x
    x = 426,544.80/635.79
  6. Step 6: Final answer
    x = 670.89

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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.