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Finding the Fourth Proportional to 3,180, 4,770.77 and 988.59

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Solution

The fourth proportional to 3,180, 4,770.77 and 988.59 is: 1,483.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,180 : 4,770.77 = 988.59 : x
  2. Step 2: Convert to fraction form
    3,180/4,770.77 = 988.59/x
  3. Step 3: Cross multiply
    3,180x = 4,770.77 × 988.59
  4. Step 4: Simplify right side
    3,180x = 4,716,330.57
  5. Step 5: Solve for x
    x = 4,716,330.57/3,180
  6. Step 6: Final answer
    x = 1,483.12

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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.