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Finding the Fourth Proportional to 1,904.80, 2,857.20 and 979.06

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Solution

The fourth proportional to 1,904.80, 2,857.20 and 979.06 is: 1,468.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,904.80 : 2,857.20 = 979.06 : x
  2. Step 2: Convert to fraction form
    1,904.80/2,857.20 = 979.06/x
  3. Step 3: Cross multiply
    1,904.80x = 2,857.20 × 979.06
  4. Step 4: Simplify right side
    1,904.80x = 2,797,370.23
  5. Step 5: Solve for x
    x = 2,797,370.23/1,904.80
  6. Step 6: Final answer
    x = 1,468.59

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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.