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Finding the Fourth Proportional to 1,319.89, 1,980.60 and 498.73

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Solution

The fourth proportional to 1,319.89, 1,980.60 and 498.73 is: 748.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.89 : 1,980.60 = 498.73 : x
  2. Step 2: Convert to fraction form
    1,319.89/1,980.60 = 498.73/x
  3. Step 3: Cross multiply
    1,319.89x = 1,980.60 × 498.73
  4. Step 4: Simplify right side
    1,319.89x = 987,784.64
  5. Step 5: Solve for x
    x = 987,784.64/1,319.89
  6. Step 6: Final answer
    x = 748.38

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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.