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Finding the Fourth Proportional to 3,178.62, 4,768 and 870.12

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Solution

The fourth proportional to 3,178.62, 4,768 and 870.12 is: 1,305.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,178.62 : 4,768 = 870.12 : x
  2. Step 2: Convert to fraction form
    3,178.62/4,768 = 870.12/x
  3. Step 3: Cross multiply
    3,178.62x = 4,768 × 870.12
  4. Step 4: Simplify right side
    3,178.62x = 4,148,732.16
  5. Step 5: Solve for x
    x = 4,148,732.16/3,178.62
  6. Step 6: Final answer
    x = 1,305.20

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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.