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Finding the Fourth Proportional to 1,319.64, 1,979.52 and 345.84

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Solution

The fourth proportional to 1,319.64, 1,979.52 and 345.84 is: 518.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.64 : 1,979.52 = 345.84 : x
  2. Step 2: Convert to fraction form
    1,319.64/1,979.52 = 345.84/x
  3. Step 3: Cross multiply
    1,319.64x = 1,979.52 × 345.84
  4. Step 4: Simplify right side
    1,319.64x = 684,597.20
  5. Step 5: Solve for x
    x = 684,597.20/1,319.64
  6. Step 6: Final answer
    x = 518.78

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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.