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Finding the Fourth Proportional to 1,992.60, 2,988.90 and 1,978.20

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Solution

The fourth proportional to 1,992.60, 2,988.90 and 1,978.20 is: 2,967.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,992.60 : 2,988.90 = 1,978.20 : x
  2. Step 2: Convert to fraction form
    1,992.60/2,988.90 = 1,978.20/x
  3. Step 3: Cross multiply
    1,992.60x = 2,988.90 × 1,978.20
  4. Step 4: Simplify right side
    1,992.60x = 5,912,641.98
  5. Step 5: Solve for x
    x = 5,912,641.98/1,992.60
  6. Step 6: Final answer
    x = 2,967.30

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1.5x scale

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.