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Finding the Fourth Proportional to 1,990.50, 2,985.75 and 774.50

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Solution

The fourth proportional to 1,990.50, 2,985.75 and 774.50 is: 1,161.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.50 : 2,985.75 = 774.50 : x
  2. Step 2: Convert to fraction form
    1,990.50/2,985.75 = 774.50/x
  3. Step 3: Cross multiply
    1,990.50x = 2,985.75 × 774.50
  4. Step 4: Simplify right side
    1,990.50x = 2,312,463.38
  5. Step 5: Solve for x
    x = 2,312,463.38/1,990.50
  6. Step 6: Final answer
    x = 1,161.75

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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.