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Finding the Fourth Proportional to 1,079.69, 1,619.64 and 339.26

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Solution

The fourth proportional to 1,079.69, 1,619.64 and 339.26 is: 508.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.69 : 1,619.64 = 339.26 : x
  2. Step 2: Convert to fraction form
    1,079.69/1,619.64 = 339.26/x
  3. Step 3: Cross multiply
    1,079.69x = 1,619.64 × 339.26
  4. Step 4: Simplify right side
    1,079.69x = 549,470.97
  5. Step 5: Solve for x
    x = 549,470.97/1,079.69
  6. Step 6: Final answer
    x = 508.92

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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.