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Finding the Fourth Proportional to 12,880, 19,322.88 and 4,672

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Solution

The fourth proportional to 12,880, 19,322.88 and 4,672 is: 7,009.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,880 : 19,322.88 = 4,672 : x
  2. Step 2: Convert to fraction form
    12,880/19,322.88 = 4,672/x
  3. Step 3: Cross multiply
    12,880x = 19,322.88 × 4,672
  4. Step 4: Simplify right side
    12,880x = 90,276,495.36
  5. Step 5: Solve for x
    x = 90,276,495.36/12,880
  6. Step 6: Final answer
    x = 7,009.04

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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.