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Finding the Fourth Proportional to 2,539.78, 3,809.65 and 690.89

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Solution

The fourth proportional to 2,539.78, 3,809.65 and 690.89 is: 1,036.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,539.78 : 3,809.65 = 690.89 : x
  2. Step 2: Convert to fraction form
    2,539.78/3,809.65 = 690.89/x
  3. Step 3: Cross multiply
    2,539.78x = 3,809.65 × 690.89
  4. Step 4: Simplify right side
    2,539.78x = 2,632,029.61
  5. Step 5: Solve for x
    x = 2,632,029.61/2,539.78
  6. Step 6: Final answer
    x = 1,036.32

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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.