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Finding the Fourth Proportional to 1,275.39, 1,763.37 and 1,256.76

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Solution

The fourth proportional to 1,275.39, 1,763.37 and 1,256.76 is: 1,737.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.39 : 1,763.37 = 1,256.76 : x
  2. Step 2: Convert to fraction form
    1,275.39/1,763.37 = 1,256.76/x
  3. Step 3: Cross multiply
    1,275.39x = 1,763.37 × 1,256.76
  4. Step 4: Simplify right side
    1,275.39x = 2,216,132.88
  5. Step 5: Solve for x
    x = 2,216,132.88/1,275.39
  6. Step 6: Final answer
    x = 1,737.61

Related Problems

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Half scale
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Double scale
Find fourth proportional to 1,276.39, 1,764.75 and 1,257.76
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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.