Home / 1,289.02-1,778.83-729.49

Finding the Fourth Proportional to 1,289.02, 1,778.83 and 729.49

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Solution

The fourth proportional to 1,289.02, 1,778.83 and 729.49 is: 1,006.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.02 : 1,778.83 = 729.49 : x
  2. Step 2: Convert to fraction form
    1,289.02/1,778.83 = 729.49/x
  3. Step 3: Cross multiply
    1,289.02x = 1,778.83 × 729.49
  4. Step 4: Simplify right side
    1,289.02x = 1,297,638.70
  5. Step 5: Solve for x
    x = 1,297,638.70/1,289.02
  6. Step 6: Final answer
    x = 1,006.69

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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.