Home / 1,989.95-2,749.66-1,432.27

Finding the Fourth Proportional to 1,989.95, 2,749.66 and 1,432.27

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Solution

The fourth proportional to 1,989.95, 2,749.66 and 1,432.27 is: 1,979.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.95 : 2,749.66 = 1,432.27 : x
  2. Step 2: Convert to fraction form
    1,989.95/2,749.66 = 1,432.27/x
  3. Step 3: Cross multiply
    1,989.95x = 2,749.66 × 1,432.27
  4. Step 4: Simplify right side
    1,989.95x = 3,938,245.07
  5. Step 5: Solve for x
    x = 3,938,245.07/1,989.95
  6. Step 6: Final answer
    x = 1,979.06

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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.