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Finding the Fourth Proportional to 2,839.48, 4,258.74 and 787

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Solution

The fourth proportional to 2,839.48, 4,258.74 and 787 is: 1,180.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,839.48 : 4,258.74 = 787 : x
  2. Step 2: Convert to fraction form
    2,839.48/4,258.74 = 787/x
  3. Step 3: Cross multiply
    2,839.48x = 4,258.74 × 787
  4. Step 4: Simplify right side
    2,839.48x = 3,351,628.38
  5. Step 5: Solve for x
    x = 3,351,628.38/2,839.48
  6. Step 6: Final answer
    x = 1,180.37

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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.