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Finding the Fourth Proportional to 3,319.80, 4,978.08 and 1,239.72

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Solution

The fourth proportional to 3,319.80, 4,978.08 and 1,239.72 is: 1,858.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,319.80 : 4,978.08 = 1,239.72 : x
  2. Step 2: Convert to fraction form
    3,319.80/4,978.08 = 1,239.72/x
  3. Step 3: Cross multiply
    3,319.80x = 4,978.08 × 1,239.72
  4. Step 4: Simplify right side
    3,319.80x = 6,171,425.34
  5. Step 5: Solve for x
    x = 6,171,425.34/3,319.80
  6. Step 6: Final answer
    x = 1,858.98

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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.