Home / 1,415.61-2,120.97-766.80

Finding the Fourth Proportional to 1,415.61, 2,120.97 and 766.80

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Solution

The fourth proportional to 1,415.61, 2,120.97 and 766.80 is: 1,148.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.61 : 2,120.97 = 766.80 : x
  2. Step 2: Convert to fraction form
    1,415.61/2,120.97 = 766.80/x
  3. Step 3: Cross multiply
    1,415.61x = 2,120.97 × 766.80
  4. Step 4: Simplify right side
    1,415.61x = 1,626,359.80
  5. Step 5: Solve for x
    x = 1,626,359.80/1,415.61
  6. Step 6: Final answer
    x = 1,148.88

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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.