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Finding the Fourth Proportional to 3,179.79, 4,770.43 and 988.40

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Solution

The fourth proportional to 3,179.79, 4,770.43 and 988.40 is: 1,482.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,179.79 : 4,770.43 = 988.40 : x
  2. Step 2: Convert to fraction form
    3,179.79/4,770.43 = 988.40/x
  3. Step 3: Cross multiply
    3,179.79x = 4,770.43 × 988.40
  4. Step 4: Simplify right side
    3,179.79x = 4,715,102.47
  5. Step 5: Solve for x
    x = 4,715,102.47/3,179.79
  6. Step 6: Final answer
    x = 1,482.83

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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.