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Finding the Fourth Proportional to 3,180.11, 4,770.79 and 988.74

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Solution

The fourth proportional to 3,180.11, 4,770.79 and 988.74 is: 1,483.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,180.11 : 4,770.79 = 988.74 : x
  2. Step 2: Convert to fraction form
    3,180.11/4,770.79 = 988.74/x
  3. Step 3: Cross multiply
    3,180.11x = 4,770.79 × 988.74
  4. Step 4: Simplify right side
    3,180.11x = 4,717,068.43
  5. Step 5: Solve for x
    x = 4,717,068.43/3,180.11
  6. Step 6: Final answer
    x = 1,483.31

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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.