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Finding the Fourth Proportional to 1,145.21, 1,718.01 and 323.60

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Solution

The fourth proportional to 1,145.21, 1,718.01 and 323.60 is: 485.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.21 : 1,718.01 = 323.60 : x
  2. Step 2: Convert to fraction form
    1,145.21/1,718.01 = 323.60/x
  3. Step 3: Cross multiply
    1,145.21x = 1,718.01 × 323.60
  4. Step 4: Simplify right side
    1,145.21x = 555,939.45
  5. Step 5: Solve for x
    x = 555,939.45/1,145.21
  6. Step 6: Final answer
    x = 485.45

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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.