Home / 1,378.32-2,062.68-1,128.63

Finding the Fourth Proportional to 1,378.32, 2,062.68 and 1,128.63

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Solution

The fourth proportional to 1,378.32, 2,062.68 and 1,128.63 is: 1,689.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.32 : 2,062.68 = 1,128.63 : x
  2. Step 2: Convert to fraction form
    1,378.32/2,062.68 = 1,128.63/x
  3. Step 3: Cross multiply
    1,378.32x = 2,062.68 × 1,128.63
  4. Step 4: Simplify right side
    1,378.32x = 2,328,002.53
  5. Step 5: Solve for x
    x = 2,328,002.53/1,378.32
  6. Step 6: Final answer
    x = 1,689.01

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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.