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Finding the Fourth Proportional to 1,982.78, 2,973.16 and 666.08

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Solution

The fourth proportional to 1,982.78, 2,973.16 and 666.08 is: 998.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,982.78 : 2,973.16 = 666.08 : x
  2. Step 2: Convert to fraction form
    1,982.78/2,973.16 = 666.08/x
  3. Step 3: Cross multiply
    1,982.78x = 2,973.16 × 666.08
  4. Step 4: Simplify right side
    1,982.78x = 1,980,362.41
  5. Step 5: Solve for x
    x = 1,980,362.41/1,982.78
  6. Step 6: Final answer
    x = 998.78

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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.