Home / 1,289.18-1,778.93-729.56

Finding the Fourth Proportional to 1,289.18, 1,778.93 and 729.56

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Solution

The fourth proportional to 1,289.18, 1,778.93 and 729.56 is: 1,006.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.18 : 1,778.93 = 729.56 : x
  2. Step 2: Convert to fraction form
    1,289.18/1,778.93 = 729.56/x
  3. Step 3: Cross multiply
    1,289.18x = 1,778.93 × 729.56
  4. Step 4: Simplify right side
    1,289.18x = 1,297,837.99
  5. Step 5: Solve for x
    x = 1,297,837.99/1,289.18
  6. Step 6: Final answer
    x = 1,006.72

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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.