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Finding the Fourth Proportional to 1,459.89, 2,189.99 and 485.73

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Solution

The fourth proportional to 1,459.89, 2,189.99 and 485.73 is: 728.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,459.89 : 2,189.99 = 485.73 : x
  2. Step 2: Convert to fraction form
    1,459.89/2,189.99 = 485.73/x
  3. Step 3: Cross multiply
    1,459.89x = 2,189.99 × 485.73
  4. Step 4: Simplify right side
    1,459.89x = 1,063,741.41
  5. Step 5: Solve for x
    x = 1,063,741.41/1,459.89
  6. Step 6: Final answer
    x = 728.64

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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.