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Finding the Fourth Proportional to 15,628, 21,567.36 and 8,554.72

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Solution

The fourth proportional to 15,628, 21,567.36 and 8,554.72 is: 11,805.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,628 : 21,567.36 = 8,554.72 : x
  2. Step 2: Convert to fraction form
    15,628/21,567.36 = 8,554.72/x
  3. Step 3: Cross multiply
    15,628x = 21,567.36 × 8,554.72
  4. Step 4: Simplify right side
    15,628x = 184,502,725.94
  5. Step 5: Solve for x
    x = 184,502,725.94/15,628
  6. Step 6: Final answer
    x = 11,805.91

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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.