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Finding the Fourth Proportional to 19,272.36, 28,908.42 and 9,915

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Solution

The fourth proportional to 19,272.36, 28,908.42 and 9,915 is: 14,872.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,272.36 : 28,908.42 = 9,915 : x
  2. Step 2: Convert to fraction form
    19,272.36/28,908.42 = 9,915/x
  3. Step 3: Cross multiply
    19,272.36x = 28,908.42 × 9,915
  4. Step 4: Simplify right side
    19,272.36x = 286,626,984.30
  5. Step 5: Solve for x
    x = 286,626,984.30/19,272.36
  6. Step 6: Final answer
    x = 14,872.44

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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.