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Finding the Fourth Proportional to 3,186.65, 4,780.65 and 965.30

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Solution

The fourth proportional to 3,186.65, 4,780.65 and 965.30 is: 1,448.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,186.65 : 4,780.65 = 965.30 : x
  2. Step 2: Convert to fraction form
    3,186.65/4,780.65 = 965.30/x
  3. Step 3: Cross multiply
    3,186.65x = 4,780.65 × 965.30
  4. Step 4: Simplify right side
    3,186.65x = 4,614,761.45
  5. Step 5: Solve for x
    x = 4,614,761.45/3,186.65
  6. Step 6: Final answer
    x = 1,448.15

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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.