Home / 1,317.60-1,816.80-1,121.76

Finding the Fourth Proportional to 1,317.60, 1,816.80 and 1,121.76

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Solution

The fourth proportional to 1,317.60, 1,816.80 and 1,121.76 is: 1,546.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.60 : 1,816.80 = 1,121.76 : x
  2. Step 2: Convert to fraction form
    1,317.60/1,816.80 = 1,121.76/x
  3. Step 3: Cross multiply
    1,317.60x = 1,816.80 × 1,121.76
  4. Step 4: Simplify right side
    1,317.60x = 2,038,013.57
  5. Step 5: Solve for x
    x = 2,038,013.57/1,317.60
  6. Step 6: Final answer
    x = 1,546.76

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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.