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Finding the Fourth Proportional to 998.76, 1,498.54 and 421.72

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Solution

The fourth proportional to 998.76, 1,498.54 and 421.72 is: 632.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.76 : 1,498.54 = 421.72 : x
  2. Step 2: Convert to fraction form
    998.76/1,498.54 = 421.72/x
  3. Step 3: Cross multiply
    998.76x = 1,498.54 × 421.72
  4. Step 4: Simplify right side
    998.76x = 631,964.29
  5. Step 5: Solve for x
    x = 631,964.29/998.76
  6. Step 6: Final answer
    x = 632.75

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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.