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Finding the Fourth Proportional to 3,178.80, 4,767.62 and 870.28

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Solution

The fourth proportional to 3,178.80, 4,767.62 and 870.28 is: 1,305.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,178.80 : 4,767.62 = 870.28 : x
  2. Step 2: Convert to fraction form
    3,178.80/4,767.62 = 870.28/x
  3. Step 3: Cross multiply
    3,178.80x = 4,767.62 × 870.28
  4. Step 4: Simplify right side
    3,178.80x = 4,149,164.33
  5. Step 5: Solve for x
    x = 4,149,164.33/3,178.80
  6. Step 6: Final answer
    x = 1,305.26

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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.