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Finding the Fourth Proportional to 3,090.78, 4,265.71 and 1,971.36

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Solution

The fourth proportional to 3,090.78, 4,265.71 and 1,971.36 is: 2,720.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,090.78 : 4,265.71 = 1,971.36 : x
  2. Step 2: Convert to fraction form
    3,090.78/4,265.71 = 1,971.36/x
  3. Step 3: Cross multiply
    3,090.78x = 4,265.71 × 1,971.36
  4. Step 4: Simplify right side
    3,090.78x = 8,409,250.07
  5. Step 5: Solve for x
    x = 8,409,250.07/3,090.78
  6. Step 6: Final answer
    x = 2,720.75

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1.5x scale

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.