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Finding the Fourth Proportional to 19,141.25, 28,715.30 and 7,890.32

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Solution

The fourth proportional to 19,141.25, 28,715.30 and 7,890.32 is: 11,836.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,141.25 : 28,715.30 = 7,890.32 : x
  2. Step 2: Convert to fraction form
    19,141.25/28,715.30 = 7,890.32/x
  3. Step 3: Cross multiply
    19,141.25x = 28,715.30 × 7,890.32
  4. Step 4: Simplify right side
    19,141.25x = 226,572,722.87
  5. Step 5: Solve for x
    x = 226,572,722.87/19,141.25
  6. Step 6: Final answer
    x = 11,836.89

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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.