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Finding the Fourth Proportional to 3,245.40, 4,479.63 and 2,808

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Solution

The fourth proportional to 3,245.40, 4,479.63 and 2,808 is: 3,875.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,245.40 : 4,479.63 = 2,808 : x
  2. Step 2: Convert to fraction form
    3,245.40/4,479.63 = 2,808/x
  3. Step 3: Cross multiply
    3,245.40x = 4,479.63 × 2,808
  4. Step 4: Simplify right side
    3,245.40x = 12,578,801.04
  5. Step 5: Solve for x
    x = 12,578,801.04/3,245.40
  6. Step 6: Final answer
    x = 3,875.89

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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.