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Finding the Fourth Proportional to 1,584.90, 2,187 and 921.78

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Solution

The fourth proportional to 1,584.90, 2,187 and 921.78 is: 1,271.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,584.90 : 2,187 = 921.78 : x
  2. Step 2: Convert to fraction form
    1,584.90/2,187 = 921.78/x
  3. Step 3: Cross multiply
    1,584.90x = 2,187 × 921.78
  4. Step 4: Simplify right side
    1,584.90x = 2,015,932.86
  5. Step 5: Solve for x
    x = 2,015,932.86/1,584.90
  6. Step 6: Final answer
    x = 1,271.96

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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.