Home / 1,312.06-1,958.92-1,128.70

Finding the Fourth Proportional to 1,312.06, 1,958.92 and 1,128.70

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Solution

The fourth proportional to 1,312.06, 1,958.92 and 1,128.70 is: 1,685.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.06 : 1,958.92 = 1,128.70 : x
  2. Step 2: Convert to fraction form
    1,312.06/1,958.92 = 1,128.70/x
  3. Step 3: Cross multiply
    1,312.06x = 1,958.92 × 1,128.70
  4. Step 4: Simplify right side
    1,312.06x = 2,211,033.00
  5. Step 5: Solve for x
    x = 2,211,033.00/1,312.06
  6. Step 6: Final answer
    x = 1,685.16

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.