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Finding the Fourth Proportional to 1,319.94, 1,979.86 and 346.02

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Solution

The fourth proportional to 1,319.94, 1,979.86 and 346.02 is: 519.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.94 : 1,979.86 = 346.02 : x
  2. Step 2: Convert to fraction form
    1,319.94/1,979.86 = 346.02/x
  3. Step 3: Cross multiply
    1,319.94x = 1,979.86 × 346.02
  4. Step 4: Simplify right side
    1,319.94x = 685,071.16
  5. Step 5: Solve for x
    x = 685,071.16/1,319.94
  6. Step 6: Final answer
    x = 519.02

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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.