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Finding the Fourth Proportional to 1,320.15, 1,980.57 and 498.44

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Solution

The fourth proportional to 1,320.15, 1,980.57 and 498.44 is: 747.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.15 : 1,980.57 = 498.44 : x
  2. Step 2: Convert to fraction form
    1,320.15/1,980.57 = 498.44/x
  3. Step 3: Cross multiply
    1,320.15x = 1,980.57 × 498.44
  4. Step 4: Simplify right side
    1,320.15x = 987,185.41
  5. Step 5: Solve for x
    x = 987,185.41/1,320.15
  6. Step 6: Final answer
    x = 747.78

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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.