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Finding the Fourth Proportional to 1,319.04, 1,979.84 and 976

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Solution

The fourth proportional to 1,319.04, 1,979.84 and 976 is: 1,464.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.04 : 1,979.84 = 976 : x
  2. Step 2: Convert to fraction form
    1,319.04/1,979.84 = 976/x
  3. Step 3: Cross multiply
    1,319.04x = 1,979.84 × 976
  4. Step 4: Simplify right side
    1,319.04x = 1,932,323.84
  5. Step 5: Solve for x
    x = 1,932,323.84/1,319.04
  6. Step 6: Final answer
    x = 1,464.95

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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.