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Finding the Fourth Proportional to 21,307.20, 31,903.20 and 16,699.20

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Solution

The fourth proportional to 21,307.20, 31,903.20 and 16,699.20 is: 25,003.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,307.20 : 31,903.20 = 16,699.20 : x
  2. Step 2: Convert to fraction form
    21,307.20/31,903.20 = 16,699.20/x
  3. Step 3: Cross multiply
    21,307.20x = 31,903.20 × 16,699.20
  4. Step 4: Simplify right side
    21,307.20x = 532,757,917.44
  5. Step 5: Solve for x
    x = 532,757,917.44/21,307.20
  6. Step 6: Final answer
    x = 25,003.66

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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.