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Finding the Fourth Proportional to 1,319.92, 1,979.93 and 346.12

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Solution

The fourth proportional to 1,319.92, 1,979.93 and 346.12 is: 519.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.92 : 1,979.93 = 346.12 : x
  2. Step 2: Convert to fraction form
    1,319.92/1,979.93 = 346.12/x
  3. Step 3: Cross multiply
    1,319.92x = 1,979.93 × 346.12
  4. Step 4: Simplify right side
    1,319.92x = 685,293.37
  5. Step 5: Solve for x
    x = 685,293.37/1,319.92
  6. Step 6: Final answer
    x = 519.19

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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.