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Finding the Fourth Proportional to 1,978.80, 2,968.20 and 517.98

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Solution

The fourth proportional to 1,978.80, 2,968.20 and 517.98 is: 776.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,978.80 : 2,968.20 = 517.98 : x
  2. Step 2: Convert to fraction form
    1,978.80/2,968.20 = 517.98/x
  3. Step 3: Cross multiply
    1,978.80x = 2,968.20 × 517.98
  4. Step 4: Simplify right side
    1,978.80x = 1,537,468.24
  5. Step 5: Solve for x
    x = 1,537,468.24/1,978.80
  6. Step 6: Final answer
    x = 776.97

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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.