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Finding the Fourth Proportional to 6,428.72, 8,870.64 and 3,775.88

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Solution

The fourth proportional to 6,428.72, 8,870.64 and 3,775.88 is: 5,210.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,428.72 : 8,870.64 = 3,775.88 : x
  2. Step 2: Convert to fraction form
    6,428.72/8,870.64 = 3,775.88/x
  3. Step 3: Cross multiply
    6,428.72x = 8,870.64 × 3,775.88
  4. Step 4: Simplify right side
    6,428.72x = 33,494,472.16
  5. Step 5: Solve for x
    x = 33,494,472.16/6,428.72
  6. Step 6: Final answer
    x = 5,210.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.