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Finding the Fourth Proportional to 1,679.94, 2,316.80 and 1,639.85

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Solution

The fourth proportional to 1,679.94, 2,316.80 and 1,639.85 is: 2,261.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,679.94 : 2,316.80 = 1,639.85 : x
  2. Step 2: Convert to fraction form
    1,679.94/2,316.80 = 1,639.85/x
  3. Step 3: Cross multiply
    1,679.94x = 2,316.80 × 1,639.85
  4. Step 4: Simplify right side
    1,679.94x = 3,799,197.00
  5. Step 5: Solve for x
    x = 3,799,197.00/1,679.94
  6. Step 6: Final answer
    x = 2,261.51

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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.