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Finding the Fourth Proportional to 2,136.65, 3,205.40 and 904.05

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Solution

The fourth proportional to 2,136.65, 3,205.40 and 904.05 is: 1,356.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,136.65 : 3,205.40 = 904.05 : x
  2. Step 2: Convert to fraction form
    2,136.65/3,205.40 = 904.05/x
  3. Step 3: Cross multiply
    2,136.65x = 3,205.40 × 904.05
  4. Step 4: Simplify right side
    2,136.65x = 2,897,837.35
  5. Step 5: Solve for x
    x = 2,897,837.35/2,136.65
  6. Step 6: Final answer
    x = 1,356.26

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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.