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Finding the Fourth Proportional to 21,086.61, 29,099.16 and 11,655.11

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Solution

The fourth proportional to 21,086.61, 29,099.16 and 11,655.11 is: 16,083.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,086.61 : 29,099.16 = 11,655.11 : x
  2. Step 2: Convert to fraction form
    21,086.61/29,099.16 = 11,655.11/x
  3. Step 3: Cross multiply
    21,086.61x = 29,099.16 × 11,655.11
  4. Step 4: Simplify right side
    21,086.61x = 339,153,765.21
  5. Step 5: Solve for x
    x = 339,153,765.21/21,086.61
  6. Step 6: Final answer
    x = 16,083.84

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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.