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Finding the Fourth Proportional to 1,858.28, 2,784.40 and 980.73

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Solution

The fourth proportional to 1,858.28, 2,784.40 and 980.73 is: 1,469.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,858.28 : 2,784.40 = 980.73 : x
  2. Step 2: Convert to fraction form
    1,858.28/2,784.40 = 980.73/x
  3. Step 3: Cross multiply
    1,858.28x = 2,784.40 × 980.73
  4. Step 4: Simplify right side
    1,858.28x = 2,730,742.16
  5. Step 5: Solve for x
    x = 2,730,742.16/1,858.28
  6. Step 6: Final answer
    x = 1,469.50

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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.