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Finding the Fourth Proportional to 1,266.77, 1,748.18 and 742.80

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Solution

The fourth proportional to 1,266.77, 1,748.18 and 742.80 is: 1,025.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,266.77 : 1,748.18 = 742.80 : x
  2. Step 2: Convert to fraction form
    1,266.77/1,748.18 = 742.80/x
  3. Step 3: Cross multiply
    1,266.77x = 1,748.18 × 742.80
  4. Step 4: Simplify right side
    1,266.77x = 1,298,556.52
  5. Step 5: Solve for x
    x = 1,298,556.52/1,266.77
  6. Step 6: Final answer
    x = 1,025.09

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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.