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Finding the Fourth Proportional to 1,980.96, 2,972.25 and 665.25

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Solution

The fourth proportional to 1,980.96, 2,972.25 and 665.25 is: 998.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,980.96 : 2,972.25 = 665.25 : x
  2. Step 2: Convert to fraction form
    1,980.96/2,972.25 = 665.25/x
  3. Step 3: Cross multiply
    1,980.96x = 2,972.25 × 665.25
  4. Step 4: Simplify right side
    1,980.96x = 1,977,289.31
  5. Step 5: Solve for x
    x = 1,977,289.31/1,980.96
  6. Step 6: Final answer
    x = 998.15

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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.