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Finding the Fourth Proportional to 998.65, 1,378.17 and 556.60

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Solution

The fourth proportional to 998.65, 1,378.17 and 556.60 is: 768.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.65 : 1,378.17 = 556.60 : x
  2. Step 2: Convert to fraction form
    998.65/1,378.17 = 556.60/x
  3. Step 3: Cross multiply
    998.65x = 1,378.17 × 556.60
  4. Step 4: Simplify right side
    998.65x = 767,089.42
  5. Step 5: Solve for x
    x = 767,089.42/998.65
  6. Step 6: Final answer
    x = 768.13

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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.