Home / 1,079.60-1,619.39-430.31

Finding the Fourth Proportional to 1,079.60, 1,619.39 and 430.31

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Solution

The fourth proportional to 1,079.60, 1,619.39 and 430.31 is: 645.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.60 : 1,619.39 = 430.31 : x
  2. Step 2: Convert to fraction form
    1,079.60/1,619.39 = 430.31/x
  3. Step 3: Cross multiply
    1,079.60x = 1,619.39 × 430.31
  4. Step 4: Simplify right side
    1,079.60x = 696,844.84
  5. Step 5: Solve for x
    x = 696,844.84/1,079.60
  6. Step 6: Final answer
    x = 645.47

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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.