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Finding the Fourth Proportional to 998.61, 1,498.29 and 485.25

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Solution

The fourth proportional to 998.61, 1,498.29 and 485.25 is: 728.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.61 : 1,498.29 = 485.25 : x
  2. Step 2: Convert to fraction form
    998.61/1,498.29 = 485.25/x
  3. Step 3: Cross multiply
    998.61x = 1,498.29 × 485.25
  4. Step 4: Simplify right side
    998.61x = 727,045.22
  5. Step 5: Solve for x
    x = 727,045.22/998.61
  6. Step 6: Final answer
    x = 728.06

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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.