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Finding the Fourth Proportional to 3,180.65, 4,770.97 and 988.79

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Solution

The fourth proportional to 3,180.65, 4,770.97 and 988.79 is: 1,483.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,180.65 : 4,770.97 = 988.79 : x
  2. Step 2: Convert to fraction form
    3,180.65/4,770.97 = 988.79/x
  3. Step 3: Cross multiply
    3,180.65x = 4,770.97 × 988.79
  4. Step 4: Simplify right side
    3,180.65x = 4,717,461.10
  5. Step 5: Solve for x
    x = 4,717,461.10/3,180.65
  6. Step 6: Final answer
    x = 1,483.18

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1.5x scale

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.