Home / 1,728.40-2,384.76-982.20

Finding the Fourth Proportional to 1,728.40, 2,384.76 and 982.20

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Solution

The fourth proportional to 1,728.40, 2,384.76 and 982.20 is: 1,355.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,728.40 : 2,384.76 = 982.20 : x
  2. Step 2: Convert to fraction form
    1,728.40/2,384.76 = 982.20/x
  3. Step 3: Cross multiply
    1,728.40x = 2,384.76 × 982.20
  4. Step 4: Simplify right side
    1,728.40x = 2,342,311.27
  5. Step 5: Solve for x
    x = 2,342,311.27/1,728.40
  6. Step 6: Final answer
    x = 1,355.19

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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.