Home / 1,989.02-2,742.31-1,242.70

Finding the Fourth Proportional to 1,989.02, 2,742.31 and 1,242.70

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Solution

The fourth proportional to 1,989.02, 2,742.31 and 1,242.70 is: 1,713.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.02 : 2,742.31 = 1,242.70 : x
  2. Step 2: Convert to fraction form
    1,989.02/2,742.31 = 1,242.70/x
  3. Step 3: Cross multiply
    1,989.02x = 2,742.31 × 1,242.70
  4. Step 4: Simplify right side
    1,989.02x = 3,407,883.49
  5. Step 5: Solve for x
    x = 3,407,883.49/1,989.02
  6. Step 6: Final answer
    x = 1,713.35

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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.