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Finding the Fourth Proportional to 988.37, 1,365.90 and 811.05

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Solution

The fourth proportional to 988.37, 1,365.90 and 811.05 is: 1,120.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.37 : 1,365.90 = 811.05 : x
  2. Step 2: Convert to fraction form
    988.37/1,365.90 = 811.05/x
  3. Step 3: Cross multiply
    988.37x = 1,365.90 × 811.05
  4. Step 4: Simplify right side
    988.37x = 1,107,806.37
  5. Step 5: Solve for x
    x = 1,107,806.37/988.37
  6. Step 6: Final answer
    x = 1,120.85

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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.