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Finding the Fourth Proportional to 1,991.79, 2,988.36 and 605.34

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Solution

The fourth proportional to 1,991.79, 2,988.36 and 605.34 is: 908.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.79 : 2,988.36 = 605.34 : x
  2. Step 2: Convert to fraction form
    1,991.79/2,988.36 = 605.34/x
  3. Step 3: Cross multiply
    1,991.79x = 2,988.36 × 605.34
  4. Step 4: Simplify right side
    1,991.79x = 1,808,973.84
  5. Step 5: Solve for x
    x = 1,808,973.84/1,991.79
  6. Step 6: Final answer
    x = 908.22

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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.