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Finding the Fourth Proportional to 13,872, 19,141.88 and 7,902.40

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Solution

The fourth proportional to 13,872, 19,141.88 and 7,902.40 is: 10,904.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,872 : 19,141.88 = 7,902.40 : x
  2. Step 2: Convert to fraction form
    13,872/19,141.88 = 7,902.40/x
  3. Step 3: Cross multiply
    13,872x = 19,141.88 × 7,902.40
  4. Step 4: Simplify right side
    13,872x = 151,266,792.51
  5. Step 5: Solve for x
    x = 151,266,792.51/13,872
  6. Step 6: Final answer
    x = 10,904.47

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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.