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Finding the Fourth Proportional to 1,319.82, 1,979.55 and 345.93

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Solution

The fourth proportional to 1,319.82, 1,979.55 and 345.93 is: 518.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.82 : 1,979.55 = 345.93 : x
  2. Step 2: Convert to fraction form
    1,319.82/1,979.55 = 345.93/x
  3. Step 3: Cross multiply
    1,319.82x = 1,979.55 × 345.93
  4. Step 4: Simplify right side
    1,319.82x = 684,785.73
  5. Step 5: Solve for x
    x = 684,785.73/1,319.82
  6. Step 6: Final answer
    x = 518.85

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Double scale
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1.5x scale

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.