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Finding the Fourth Proportional to 988.04, 1,362.78 and 633.64

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Solution

The fourth proportional to 988.04, 1,362.78 and 633.64 is: 873.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.04 : 1,362.78 = 633.64 : x
  2. Step 2: Convert to fraction form
    988.04/1,362.78 = 633.64/x
  3. Step 3: Cross multiply
    988.04x = 1,362.78 × 633.64
  4. Step 4: Simplify right side
    988.04x = 863,511.92
  5. Step 5: Solve for x
    x = 863,511.92/988.04
  6. Step 6: Final answer
    x = 873.96

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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.