Home / 1,680.39-2,315.93-1,288.35

Finding the Fourth Proportional to 1,680.39, 2,315.93 and 1,288.35

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Solution

The fourth proportional to 1,680.39, 2,315.93 and 1,288.35 is: 1,775.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,680.39 : 2,315.93 = 1,288.35 : x
  2. Step 2: Convert to fraction form
    1,680.39/2,315.93 = 1,288.35/x
  3. Step 3: Cross multiply
    1,680.39x = 2,315.93 × 1,288.35
  4. Step 4: Simplify right side
    1,680.39x = 2,983,721.97
  5. Step 5: Solve for x
    x = 2,983,721.97/1,680.39
  6. Step 6: Final answer
    x = 1,775.61

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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.