Home / 1,079.60-1,619.82-430.79

Finding the Fourth Proportional to 1,079.60, 1,619.82 and 430.79

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Solution

The fourth proportional to 1,079.60, 1,619.82 and 430.79 is: 646.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.60 : 1,619.82 = 430.79 : x
  2. Step 2: Convert to fraction form
    1,079.60/1,619.82 = 430.79/x
  3. Step 3: Cross multiply
    1,079.60x = 1,619.82 × 430.79
  4. Step 4: Simplify right side
    1,079.60x = 697,794.16
  5. Step 5: Solve for x
    x = 697,794.16/1,079.60
  6. Step 6: Final answer
    x = 646.35

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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.