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Finding the Fourth Proportional to 1,409.81, 2,114.55 and 485.33

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Solution

The fourth proportional to 1,409.81, 2,114.55 and 485.33 is: 727.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,409.81 : 2,114.55 = 485.33 : x
  2. Step 2: Convert to fraction form
    1,409.81/2,114.55 = 485.33/x
  3. Step 3: Cross multiply
    1,409.81x = 2,114.55 × 485.33
  4. Step 4: Simplify right side
    1,409.81x = 1,026,243.98
  5. Step 5: Solve for x
    x = 1,026,243.98/1,409.81
  6. Step 6: Final answer
    x = 727.93

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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.