Home / 1,320.75-1,981.26-455.06

Finding the Fourth Proportional to 1,320.75, 1,981.26 and 455.06

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Solution

The fourth proportional to 1,320.75, 1,981.26 and 455.06 is: 682.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.75 : 1,981.26 = 455.06 : x
  2. Step 2: Convert to fraction form
    1,320.75/1,981.26 = 455.06/x
  3. Step 3: Cross multiply
    1,320.75x = 1,981.26 × 455.06
  4. Step 4: Simplify right side
    1,320.75x = 901,597.13
  5. Step 5: Solve for x
    x = 901,597.13/1,320.75
  6. Step 6: Final answer
    x = 682.64

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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.