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Finding the Fourth Proportional to 21,305.60, 31,958.40 and 16,899.20

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Solution

The fourth proportional to 21,305.60, 31,958.40 and 16,899.20 is: 25,348.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,305.60 : 31,958.40 = 16,899.20 : x
  2. Step 2: Convert to fraction form
    21,305.60/31,958.40 = 16,899.20/x
  3. Step 3: Cross multiply
    21,305.60x = 31,958.40 × 16,899.20
  4. Step 4: Simplify right side
    21,305.60x = 540,071,393.28
  5. Step 5: Solve for x
    x = 540,071,393.28/21,305.60
  6. Step 6: Final answer
    x = 25,348.80

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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.