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Finding the Fourth Proportional to 6,872, 10,312.80 and 2,768

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Solution

The fourth proportional to 6,872, 10,312.80 and 2,768 is: 4,153.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,872 : 10,312.80 = 2,768 : x
  2. Step 2: Convert to fraction form
    6,872/10,312.80 = 2,768/x
  3. Step 3: Cross multiply
    6,872x = 10,312.80 × 2,768
  4. Step 4: Simplify right side
    6,872x = 28,545,830.40
  5. Step 5: Solve for x
    x = 28,545,830.40/6,872
  6. Step 6: Final answer
    x = 4,153.93

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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.