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Finding the Fourth Proportional to 1,362.61, 2,043.81 and 485.08

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Solution

The fourth proportional to 1,362.61, 2,043.81 and 485.08 is: 727.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,362.61 : 2,043.81 = 485.08 : x
  2. Step 2: Convert to fraction form
    1,362.61/2,043.81 = 485.08/x
  3. Step 3: Cross multiply
    1,362.61x = 2,043.81 × 485.08
  4. Step 4: Simplify right side
    1,362.61x = 991,406.25
  5. Step 5: Solve for x
    x = 991,406.25/1,362.61
  6. Step 6: Final answer
    x = 727.58

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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.