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Finding the Fourth Proportional to 1,584.83, 2,186.95 and 921.63

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Solution

The fourth proportional to 1,584.83, 2,186.95 and 921.63 is: 1,271.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,584.83 : 2,186.95 = 921.63 : x
  2. Step 2: Convert to fraction form
    1,584.83/2,186.95 = 921.63/x
  3. Step 3: Cross multiply
    1,584.83x = 2,186.95 × 921.63
  4. Step 4: Simplify right side
    1,584.83x = 2,015,556.42
  5. Step 5: Solve for x
    x = 2,015,556.42/1,584.83
  6. Step 6: Final answer
    x = 1,271.78

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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.