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Finding the Fourth Proportional to 1,459.21, 2,188 and 484.78

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Solution

The fourth proportional to 1,459.21, 2,188 and 484.78 is: 726.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,459.21 : 2,188 = 484.78 : x
  2. Step 2: Convert to fraction form
    1,459.21/2,188 = 484.78/x
  3. Step 3: Cross multiply
    1,459.21x = 2,188 × 484.78
  4. Step 4: Simplify right side
    1,459.21x = 1,060,698.64
  5. Step 5: Solve for x
    x = 1,060,698.64/1,459.21
  6. Step 6: Final answer
    x = 726.90

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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.