Home / 1,378.85-2,063.45-1,129.17

Finding the Fourth Proportional to 1,378.85, 2,063.45 and 1,129.17

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Solution

The fourth proportional to 1,378.85, 2,063.45 and 1,129.17 is: 1,689.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.85 : 2,063.45 = 1,129.17 : x
  2. Step 2: Convert to fraction form
    1,378.85/2,063.45 = 1,129.17/x
  3. Step 3: Cross multiply
    1,378.85x = 2,063.45 × 1,129.17
  4. Step 4: Simplify right side
    1,378.85x = 2,329,980.19
  5. Step 5: Solve for x
    x = 2,329,980.19/1,378.85
  6. Step 6: Final answer
    x = 1,689.81

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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.