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Finding the Fourth Proportional to 2,869, 4,302.88 and 921.36

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Solution

The fourth proportional to 2,869, 4,302.88 and 921.36 is: 1,381.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,869 : 4,302.88 = 921.36 : x
  2. Step 2: Convert to fraction form
    2,869/4,302.88 = 921.36/x
  3. Step 3: Cross multiply
    2,869x = 4,302.88 × 921.36
  4. Step 4: Simplify right side
    2,869x = 3,964,501.52
  5. Step 5: Solve for x
    x = 3,964,501.52/2,869
  6. Step 6: Final answer
    x = 1,381.84

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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.