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Finding the Fourth Proportional to 2,564.80, 3,847.04 and 921.30

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Solution

The fourth proportional to 2,564.80, 3,847.04 and 921.30 is: 1,381.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,564.80 : 3,847.04 = 921.30 : x
  2. Step 2: Convert to fraction form
    2,564.80/3,847.04 = 921.30/x
  3. Step 3: Cross multiply
    2,564.80x = 3,847.04 × 921.30
  4. Step 4: Simplify right side
    2,564.80x = 3,544,277.95
  5. Step 5: Solve for x
    x = 3,544,277.95/2,564.80
  6. Step 6: Final answer
    x = 1,381.89

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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.