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Finding the Fourth Proportional to 998, 1,497.72 and 871.28

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Solution

The fourth proportional to 998, 1,497.72 and 871.28 is: 1,307.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    998 : 1,497.72 = 871.28 : x
  2. Step 2: Convert to fraction form
    998/1,497.72 = 871.28/x
  3. Step 3: Cross multiply
    998x = 1,497.72 × 871.28
  4. Step 4: Simplify right side
    998x = 1,304,933.48
  5. Step 5: Solve for x
    x = 1,304,933.48/998
  6. Step 6: Final answer
    x = 1,307.55

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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.