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Finding the Fourth Proportional to 3,387.78, 4,674.78 and 1,971.20

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Solution

The fourth proportional to 3,387.78, 4,674.78 and 1,971.20 is: 2,720.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,387.78 : 4,674.78 = 1,971.20 : x
  2. Step 2: Convert to fraction form
    3,387.78/4,674.78 = 1,971.20/x
  3. Step 3: Cross multiply
    3,387.78x = 4,674.78 × 1,971.20
  4. Step 4: Simplify right side
    3,387.78x = 9,214,926.34
  5. Step 5: Solve for x
    x = 9,214,926.34/3,387.78
  6. Step 6: Final answer
    x = 2,720.05

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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.