Home / 1,080.48-1,619.79-430.80

Finding the Fourth Proportional to 1,080.48, 1,619.79 and 430.80

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Solution

The fourth proportional to 1,080.48, 1,619.79 and 430.80 is: 645.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.48 : 1,619.79 = 430.80 : x
  2. Step 2: Convert to fraction form
    1,080.48/1,619.79 = 430.80/x
  3. Step 3: Cross multiply
    1,080.48x = 1,619.79 × 430.80
  4. Step 4: Simplify right side
    1,080.48x = 697,805.53
  5. Step 5: Solve for x
    x = 697,805.53/1,080.48
  6. Step 6: Final answer
    x = 645.83

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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.