Home / 1,786.20-2,459.61-1,390.92

Finding the Fourth Proportional to 1,786.20, 2,459.61 and 1,390.92

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Solution

The fourth proportional to 1,786.20, 2,459.61 and 1,390.92 is: 1,915.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,786.20 : 2,459.61 = 1,390.92 : x
  2. Step 2: Convert to fraction form
    1,786.20/2,459.61 = 1,390.92/x
  3. Step 3: Cross multiply
    1,786.20x = 2,459.61 × 1,390.92
  4. Step 4: Simplify right side
    1,786.20x = 3,421,120.74
  5. Step 5: Solve for x
    x = 3,421,120.74/1,786.20
  6. Step 6: Final answer
    x = 1,915.31

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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.