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Finding the Fourth Proportional to 21,915, 32,856.10 and 7,115.09

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Solution

The fourth proportional to 21,915, 32,856.10 and 7,115.09 is: 10,667.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,915 : 32,856.10 = 7,115.09 : x
  2. Step 2: Convert to fraction form
    21,915/32,856.10 = 7,115.09/x
  3. Step 3: Cross multiply
    21,915x = 32,856.10 × 7,115.09
  4. Step 4: Simplify right side
    21,915x = 233,773,926.48
  5. Step 5: Solve for x
    x = 233,773,926.48/21,915
  6. Step 6: Final answer
    x = 10,667.30

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1.5x scale

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.