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Finding the Fourth Proportional to 1,280.11, 1,766.77 and 741.67

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Solution

The fourth proportional to 1,280.11, 1,766.77 and 741.67 is: 1,023.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.11 : 1,766.77 = 741.67 : x
  2. Step 2: Convert to fraction form
    1,280.11/1,766.77 = 741.67/x
  3. Step 3: Cross multiply
    1,280.11x = 1,766.77 × 741.67
  4. Step 4: Simplify right side
    1,280.11x = 1,310,360.31
  5. Step 5: Solve for x
    x = 1,310,360.31/1,280.11
  6. Step 6: Final answer
    x = 1,023.63

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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.