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Finding the Fourth Proportional to 1,990.70, 2,985.63 and 757.68

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Solution

The fourth proportional to 1,990.70, 2,985.63 and 757.68 is: 1,136.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.70 : 2,985.63 = 757.68 : x
  2. Step 2: Convert to fraction form
    1,990.70/2,985.63 = 757.68/x
  3. Step 3: Cross multiply
    1,990.70x = 2,985.63 × 757.68
  4. Step 4: Simplify right side
    1,990.70x = 2,262,152.14
  5. Step 5: Solve for x
    x = 2,262,152.14/1,990.70
  6. Step 6: Final answer
    x = 1,136.36

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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.