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Finding the Fourth Proportional to 21,666.76, 29,899.92 and 12,235.12

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Solution

The fourth proportional to 21,666.76, 29,899.92 and 12,235.12 is: 16,884.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,666.76 : 29,899.92 = 12,235.12 : x
  2. Step 2: Convert to fraction form
    21,666.76/29,899.92 = 12,235.12/x
  3. Step 3: Cross multiply
    21,666.76x = 29,899.92 × 12,235.12
  4. Step 4: Simplify right side
    21,666.76x = 365,829,109.19
  5. Step 5: Solve for x
    x = 365,829,109.19/21,666.76
  6. Step 6: Final answer
    x = 16,884.35

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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.