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Finding the Fourth Proportional to 15,678.72, 21,636.54 and 8,605.08

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Solution

The fourth proportional to 15,678.72, 21,636.54 and 8,605.08 is: 11,874.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,678.72 : 21,636.54 = 8,605.08 : x
  2. Step 2: Convert to fraction form
    15,678.72/21,636.54 = 8,605.08/x
  3. Step 3: Cross multiply
    15,678.72x = 21,636.54 × 8,605.08
  4. Step 4: Simplify right side
    15,678.72x = 186,184,157.62
  5. Step 5: Solve for x
    x = 186,184,157.62/15,678.72
  6. Step 6: Final answer
    x = 11,874.96

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1.5x scale

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.