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Finding the Fourth Proportional to 1,990.26, 2,985.59 and 757.34

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Solution

The fourth proportional to 1,990.26, 2,985.59 and 757.34 is: 1,136.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.26 : 2,985.59 = 757.34 : x
  2. Step 2: Convert to fraction form
    1,990.26/2,985.59 = 757.34/x
  3. Step 3: Cross multiply
    1,990.26x = 2,985.59 × 757.34
  4. Step 4: Simplify right side
    1,990.26x = 2,261,088.02
  5. Step 5: Solve for x
    x = 2,261,088.02/1,990.26
  6. Step 6: Final answer
    x = 1,136.08

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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.