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Finding the Fourth Proportional to 2,485.28, 3,725.36 and 841.28

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Solution

The fourth proportional to 2,485.28, 3,725.36 and 841.28 is: 1,261.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,485.28 : 3,725.36 = 841.28 : x
  2. Step 2: Convert to fraction form
    2,485.28/3,725.36 = 841.28/x
  3. Step 3: Cross multiply
    2,485.28x = 3,725.36 × 841.28
  4. Step 4: Simplify right side
    2,485.28x = 3,134,070.86
  5. Step 5: Solve for x
    x = 3,134,070.86/2,485.28
  6. Step 6: Final answer
    x = 1,261.05

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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.