Home / 1,275.80-1,905.05-1,012.85

Finding the Fourth Proportional to 1,275.80, 1,905.05 and 1,012.85

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Solution

The fourth proportional to 1,275.80, 1,905.05 and 1,012.85 is: 1,512.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.80 : 1,905.05 = 1,012.85 : x
  2. Step 2: Convert to fraction form
    1,275.80/1,905.05 = 1,012.85/x
  3. Step 3: Cross multiply
    1,275.80x = 1,905.05 × 1,012.85
  4. Step 4: Simplify right side
    1,275.80x = 1,929,529.89
  5. Step 5: Solve for x
    x = 1,929,529.89/1,275.80
  6. Step 6: Final answer
    x = 1,512.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.