Home / 1,379.20-2,068.75-339.15

Finding the Fourth Proportional to 1,379.20, 2,068.75 and 339.15

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Solution

The fourth proportional to 1,379.20, 2,068.75 and 339.15 is: 508.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.20 : 2,068.75 = 339.15 : x
  2. Step 2: Convert to fraction form
    1,379.20/2,068.75 = 339.15/x
  3. Step 3: Cross multiply
    1,379.20x = 2,068.75 × 339.15
  4. Step 4: Simplify right side
    1,379.20x = 701,623.79
  5. Step 5: Solve for x
    x = 701,623.79/1,379.20
  6. Step 6: Final answer
    x = 508.72

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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.