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Finding the Fourth Proportional to 2,455, 3,681.60 and 811.08

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Solution

The fourth proportional to 2,455, 3,681.60 and 811.08 is: 1,216.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,455 : 3,681.60 = 811.08 : x
  2. Step 2: Convert to fraction form
    2,455/3,681.60 = 811.08/x
  3. Step 3: Cross multiply
    2,455x = 3,681.60 × 811.08
  4. Step 4: Simplify right side
    2,455x = 2,986,072.13
  5. Step 5: Solve for x
    x = 2,986,072.13/2,455
  6. Step 6: Final answer
    x = 1,216.32

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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.