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Finding the Fourth Proportional to 636.79, 955.19 and 420.32

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Solution

The fourth proportional to 636.79, 955.19 and 420.32 is: 630.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.79 : 955.19 = 420.32 : x
  2. Step 2: Convert to fraction form
    636.79/955.19 = 420.32/x
  3. Step 3: Cross multiply
    636.79x = 955.19 × 420.32
  4. Step 4: Simplify right side
    636.79x = 401,485.46
  5. Step 5: Solve for x
    x = 401,485.46/636.79
  6. Step 6: Final answer
    x = 630.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.