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Finding the Fourth Proportional to 998.88, 1,378.16 and 606.08

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Solution

The fourth proportional to 998.88, 1,378.16 and 606.08 is: 836.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.88 : 1,378.16 = 606.08 : x
  2. Step 2: Convert to fraction form
    998.88/1,378.16 = 606.08/x
  3. Step 3: Cross multiply
    998.88x = 1,378.16 × 606.08
  4. Step 4: Simplify right side
    998.88x = 835,275.21
  5. Step 5: Solve for x
    x = 835,275.21/998.88
  6. Step 6: Final answer
    x = 836.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.