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Finding the Fourth Proportional to 4,915, 7,372.50 and 2,179

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Solution

The fourth proportional to 4,915, 7,372.50 and 2,179 is: 3,268.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,915 : 7,372.50 = 2,179 : x
  2. Step 2: Convert to fraction form
    4,915/7,372.50 = 2,179/x
  3. Step 3: Cross multiply
    4,915x = 7,372.50 × 2,179
  4. Step 4: Simplify right side
    4,915x = 16,064,677.50
  5. Step 5: Solve for x
    x = 16,064,677.50/4,915
  6. Step 6: Final answer
    x = 3,268.50

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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.