Home / 1,680.32-2,518.28-858.80

Finding the Fourth Proportional to 1,680.32, 2,518.28 and 858.80

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Solution

The fourth proportional to 1,680.32, 2,518.28 and 858.80 is: 1,287.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,680.32 : 2,518.28 = 858.80 : x
  2. Step 2: Convert to fraction form
    1,680.32/2,518.28 = 858.80/x
  3. Step 3: Cross multiply
    1,680.32x = 2,518.28 × 858.80
  4. Step 4: Simplify right side
    1,680.32x = 2,162,698.86
  5. Step 5: Solve for x
    x = 2,162,698.86/1,680.32
  6. Step 6: Final answer
    x = 1,287.08

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.