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Finding the Fourth Proportional to 15,381.16, 21,225.54 and 8,667.16

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Solution

The fourth proportional to 15,381.16, 21,225.54 and 8,667.16 is: 11,960.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,381.16 : 21,225.54 = 8,667.16 : x
  2. Step 2: Convert to fraction form
    15,381.16/21,225.54 = 8,667.16/x
  3. Step 3: Cross multiply
    15,381.16x = 21,225.54 × 8,667.16
  4. Step 4: Simplify right side
    15,381.16x = 183,965,151.27
  5. Step 5: Solve for x
    x = 183,965,151.27/15,381.16
  6. Step 6: Final answer
    x = 11,960.42

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Double scale
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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.