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Finding the Fourth Proportional to 1,990.45, 2,985.66 and 835.39

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Solution

The fourth proportional to 1,990.45, 2,985.66 and 835.39 is: 1,253.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.45 : 2,985.66 = 835.39 : x
  2. Step 2: Convert to fraction form
    1,990.45/2,985.66 = 835.39/x
  3. Step 3: Cross multiply
    1,990.45x = 2,985.66 × 835.39
  4. Step 4: Simplify right side
    1,990.45x = 2,494,190.51
  5. Step 5: Solve for x
    x = 2,494,190.51/1,990.45
  6. Step 6: Final answer
    x = 1,253.08

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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.