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Finding the Fourth Proportional to 1,584.74, 2,187.30 and 921.68

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Solution

The fourth proportional to 1,584.74, 2,187.30 and 921.68 is: 1,272.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,584.74 : 2,187.30 = 921.68 : x
  2. Step 2: Convert to fraction form
    1,584.74/2,187.30 = 921.68/x
  3. Step 3: Cross multiply
    1,584.74x = 2,187.30 × 921.68
  4. Step 4: Simplify right side
    1,584.74x = 2,015,990.66
  5. Step 5: Solve for x
    x = 2,015,990.66/1,584.74
  6. Step 6: Final answer
    x = 1,272.13

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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.