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Finding the Fourth Proportional to 1,319.67, 1,979.52 and 345.87

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Solution

The fourth proportional to 1,319.67, 1,979.52 and 345.87 is: 518.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.67 : 1,979.52 = 345.87 : x
  2. Step 2: Convert to fraction form
    1,319.67/1,979.52 = 345.87/x
  3. Step 3: Cross multiply
    1,319.67x = 1,979.52 × 345.87
  4. Step 4: Simplify right side
    1,319.67x = 684,656.58
  5. Step 5: Solve for x
    x = 684,656.58/1,319.67
  6. Step 6: Final answer
    x = 518.81

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Double scale
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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.