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Finding the Fourth Proportional to 28,636.88, 42,956.40 and 8,917.16

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Solution

The fourth proportional to 28,636.88, 42,956.40 and 8,917.16 is: 13,376.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,636.88 : 42,956.40 = 8,917.16 : x
  2. Step 2: Convert to fraction form
    28,636.88/42,956.40 = 8,917.16/x
  3. Step 3: Cross multiply
    28,636.88x = 42,956.40 × 8,917.16
  4. Step 4: Simplify right side
    28,636.88x = 383,049,091.82
  5. Step 5: Solve for x
    x = 383,049,091.82/28,636.88
  6. Step 6: Final answer
    x = 13,376.08

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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.