Home / 1,328.70-1,989.45-1,038.30

Finding the Fourth Proportional to 1,328.70, 1,989.45 and 1,038.30

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Solution

The fourth proportional to 1,328.70, 1,989.45 and 1,038.30 is: 1,554.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.70 : 1,989.45 = 1,038.30 : x
  2. Step 2: Convert to fraction form
    1,328.70/1,989.45 = 1,038.30/x
  3. Step 3: Cross multiply
    1,328.70x = 1,989.45 × 1,038.30
  4. Step 4: Simplify right side
    1,328.70x = 2,065,645.94
  5. Step 5: Solve for x
    x = 2,065,645.94/1,328.70
  6. Step 6: Final answer
    x = 1,554.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.