Home / 1,628.32-2,245.63-1,278.40

Finding the Fourth Proportional to 1,628.32, 2,245.63 and 1,278.40

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Solution

The fourth proportional to 1,628.32, 2,245.63 and 1,278.40 is: 1,763.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,628.32 : 2,245.63 = 1,278.40 : x
  2. Step 2: Convert to fraction form
    1,628.32/2,245.63 = 1,278.40/x
  3. Step 3: Cross multiply
    1,628.32x = 2,245.63 × 1,278.40
  4. Step 4: Simplify right side
    1,628.32x = 2,870,795.77
  5. Step 5: Solve for x
    x = 2,870,795.77/1,628.32
  6. Step 6: Final answer
    x = 1,763.05

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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.