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Finding the Fourth Proportional to 1,284, 1,770.57 and 890.88

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Solution

The fourth proportional to 1,284, 1,770.57 and 890.88 is: 1,228.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,284 : 1,770.57 = 890.88 : x
  2. Step 2: Convert to fraction form
    1,284/1,770.57 = 890.88/x
  3. Step 3: Cross multiply
    1,284x = 1,770.57 × 890.88
  4. Step 4: Simplify right side
    1,284x = 1,577,365.40
  5. Step 5: Solve for x
    x = 1,577,365.40/1,284
  6. Step 6: Final answer
    x = 1,228.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.