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Finding the Fourth Proportional to 3,178, 4,767.09 and 869.50

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Solution

The fourth proportional to 3,178, 4,767.09 and 869.50 is: 1,304.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,178 : 4,767.09 = 869.50 : x
  2. Step 2: Convert to fraction form
    3,178/4,767.09 = 869.50/x
  3. Step 3: Cross multiply
    3,178x = 4,767.09 × 869.50
  4. Step 4: Simplify right side
    3,178x = 4,144,984.76
  5. Step 5: Solve for x
    x = 4,144,984.76/3,178
  6. Step 6: Final answer
    x = 1,304.27

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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.