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Finding the Fourth Proportional to 492.60, 739.80 and 419.88

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Solution

The fourth proportional to 492.60, 739.80 and 419.88 is: 630.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.60 : 739.80 = 419.88 : x
  2. Step 2: Convert to fraction form
    492.60/739.80 = 419.88/x
  3. Step 3: Cross multiply
    492.60x = 739.80 × 419.88
  4. Step 4: Simplify right side
    492.60x = 310,627.22
  5. Step 5: Solve for x
    x = 310,627.22/492.60
  6. Step 6: Final answer
    x = 630.59

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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.