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Finding the Fourth Proportional to 670.68, 1,005.86 and 323.84

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Solution

The fourth proportional to 670.68, 1,005.86 and 323.84 is: 485.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.68 : 1,005.86 = 323.84 : x
  2. Step 2: Convert to fraction form
    670.68/1,005.86 = 323.84/x
  3. Step 3: Cross multiply
    670.68x = 1,005.86 × 323.84
  4. Step 4: Simplify right side
    670.68x = 325,741.03
  5. Step 5: Solve for x
    x = 325,741.03/670.68
  6. Step 6: Final answer
    x = 485.69

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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.