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Finding the Fourth Proportional to 1,289.06, 1,778.91 and 729.53

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Solution

The fourth proportional to 1,289.06, 1,778.91 and 729.53 is: 1,006.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.06 : 1,778.91 = 729.53 : x
  2. Step 2: Convert to fraction form
    1,289.06/1,778.91 = 729.53/x
  3. Step 3: Cross multiply
    1,289.06x = 1,778.91 × 729.53
  4. Step 4: Simplify right side
    1,289.06x = 1,297,768.21
  5. Step 5: Solve for x
    x = 1,297,768.21/1,289.06
  6. Step 6: Final answer
    x = 1,006.76

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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.