Home / 1,320.76-1,981.38-455.64

Finding the Fourth Proportional to 1,320.76, 1,981.38 and 455.64

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Solution

The fourth proportional to 1,320.76, 1,981.38 and 455.64 is: 683.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.76 : 1,981.38 = 455.64 : x
  2. Step 2: Convert to fraction form
    1,320.76/1,981.38 = 455.64/x
  3. Step 3: Cross multiply
    1,320.76x = 1,981.38 × 455.64
  4. Step 4: Simplify right side
    1,320.76x = 902,795.98
  5. Step 5: Solve for x
    x = 902,795.98/1,320.76
  6. Step 6: Final answer
    x = 683.54

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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.