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Finding the Fourth Proportional to 1,275.76, 1,760.36 and 778.57

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Solution

The fourth proportional to 1,275.76, 1,760.36 and 778.57 is: 1,074.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.76 : 1,760.36 = 778.57 : x
  2. Step 2: Convert to fraction form
    1,275.76/1,760.36 = 778.57/x
  3. Step 3: Cross multiply
    1,275.76x = 1,760.36 × 778.57
  4. Step 4: Simplify right side
    1,275.76x = 1,370,555.19
  5. Step 5: Solve for x
    x = 1,370,555.19/1,275.76
  6. Step 6: Final answer
    x = 1,074.31

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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.