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Finding the Fourth Proportional to 420.66, 631.08 and 359.64

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Solution

The fourth proportional to 420.66, 631.08 and 359.64 is: 539.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.66 : 631.08 = 359.64 : x
  2. Step 2: Convert to fraction form
    420.66/631.08 = 359.64/x
  3. Step 3: Cross multiply
    420.66x = 631.08 × 359.64
  4. Step 4: Simplify right side
    420.66x = 226,961.61
  5. Step 5: Solve for x
    x = 226,961.61/420.66
  6. Step 6: Final answer
    x = 539.54

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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.