Home / 1,080.28-1,619.87-430.66

Finding the Fourth Proportional to 1,080.28, 1,619.87 and 430.66

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Solution

The fourth proportional to 1,080.28, 1,619.87 and 430.66 is: 645.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.28 : 1,619.87 = 430.66 : x
  2. Step 2: Convert to fraction form
    1,080.28/1,619.87 = 430.66/x
  3. Step 3: Cross multiply
    1,080.28x = 1,619.87 × 430.66
  4. Step 4: Simplify right side
    1,080.28x = 697,613.21
  5. Step 5: Solve for x
    x = 697,613.21/1,080.28
  6. Step 6: Final answer
    x = 645.77

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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.