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Finding the Fourth Proportional to 637.08, 955.61 and 420.60

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Solution

The fourth proportional to 637.08, 955.61 and 420.60 is: 630.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    637.08 : 955.61 = 420.60 : x
  2. Step 2: Convert to fraction form
    637.08/955.61 = 420.60/x
  3. Step 3: Cross multiply
    637.08x = 955.61 × 420.60
  4. Step 4: Simplify right side
    637.08x = 401,929.57
  5. Step 5: Solve for x
    x = 401,929.57/637.08
  6. Step 6: Final answer
    x = 630.89

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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.