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Finding the Fourth Proportional to 21,242.88, 31,869.84 and 8,088.12

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Solution

The fourth proportional to 21,242.88, 31,869.84 and 8,088.12 is: 12,134.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,242.88 : 31,869.84 = 8,088.12 : x
  2. Step 2: Convert to fraction form
    21,242.88/31,869.84 = 8,088.12/x
  3. Step 3: Cross multiply
    21,242.88x = 31,869.84 × 8,088.12
  4. Step 4: Simplify right side
    21,242.88x = 257,767,090.30
  5. Step 5: Solve for x
    x = 257,767,090.30/21,242.88
  6. Step 6: Final answer
    x = 12,134.28

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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.