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Finding the Fourth Proportional to 998.47, 1,497.58 and 478.32

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Solution

The fourth proportional to 998.47, 1,497.58 and 478.32 is: 717.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.47 : 1,497.58 = 478.32 : x
  2. Step 2: Convert to fraction form
    998.47/1,497.58 = 478.32/x
  3. Step 3: Cross multiply
    998.47x = 1,497.58 × 478.32
  4. Step 4: Simplify right side
    998.47x = 716,322.47
  5. Step 5: Solve for x
    x = 716,322.47/998.47
  6. Step 6: Final answer
    x = 717.42

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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.