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Finding the Fourth Proportional to 1,716.90, 2,574.14 and 839.67

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Solution

The fourth proportional to 1,716.90, 2,574.14 and 839.67 is: 1,258.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,716.90 : 2,574.14 = 839.67 : x
  2. Step 2: Convert to fraction form
    1,716.90/2,574.14 = 839.67/x
  3. Step 3: Cross multiply
    1,716.90x = 2,574.14 × 839.67
  4. Step 4: Simplify right side
    1,716.90x = 2,161,423.94
  5. Step 5: Solve for x
    x = 2,161,423.94/1,716.90
  6. Step 6: Final answer
    x = 1,258.91

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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.