Home / 1,461.20-2,015.70-989.11

Finding the Fourth Proportional to 1,461.20, 2,015.70 and 989.11

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Solution

The fourth proportional to 1,461.20, 2,015.70 and 989.11 is: 1,364.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,461.20 : 2,015.70 = 989.11 : x
  2. Step 2: Convert to fraction form
    1,461.20/2,015.70 = 989.11/x
  3. Step 3: Cross multiply
    1,461.20x = 2,015.70 × 989.11
  4. Step 4: Simplify right side
    1,461.20x = 1,993,743.99
  5. Step 5: Solve for x
    x = 1,993,743.99/1,461.20
  6. Step 6: Final answer
    x = 1,364.46

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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.