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Finding the Fourth Proportional to 2,752.78, 4,129.13 and 1,290.89

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Solution

The fourth proportional to 2,752.78, 4,129.13 and 1,290.89 is: 1,936.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,752.78 : 4,129.13 = 1,290.89 : x
  2. Step 2: Convert to fraction form
    2,752.78/4,129.13 = 1,290.89/x
  3. Step 3: Cross multiply
    2,752.78x = 4,129.13 × 1,290.89
  4. Step 4: Simplify right side
    2,752.78x = 5,330,246.17
  5. Step 5: Solve for x
    x = 5,330,246.17/2,752.78
  6. Step 6: Final answer
    x = 1,936.32

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1.5x scale

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.