Home / 1,280.84-1,769.68-1,139.70

Finding the Fourth Proportional to 1,280.84, 1,769.68 and 1,139.70

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Solution

The fourth proportional to 1,280.84, 1,769.68 and 1,139.70 is: 1,574.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.84 : 1,769.68 = 1,139.70 : x
  2. Step 2: Convert to fraction form
    1,280.84/1,769.68 = 1,139.70/x
  3. Step 3: Cross multiply
    1,280.84x = 1,769.68 × 1,139.70
  4. Step 4: Simplify right side
    1,280.84x = 2,016,904.30
  5. Step 5: Solve for x
    x = 2,016,904.30/1,280.84
  6. Step 6: Final answer
    x = 1,574.67

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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.