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Finding the Fourth Proportional to 1,171.84, 1,754.64 and 988.80

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Solution

The fourth proportional to 1,171.84, 1,754.64 and 988.80 is: 1,480.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,171.84 : 1,754.64 = 988.80 : x
  2. Step 2: Convert to fraction form
    1,171.84/1,754.64 = 988.80/x
  3. Step 3: Cross multiply
    1,171.84x = 1,754.64 × 988.80
  4. Step 4: Simplify right side
    1,171.84x = 1,734,988.03
  5. Step 5: Solve for x
    x = 1,734,988.03/1,171.84
  6. Step 6: Final answer
    x = 1,480.57

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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.