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Finding the Fourth Proportional to 21,699.99, 29,950.34 and 12,750.39

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Solution

The fourth proportional to 21,699.99, 29,950.34 and 12,750.39 is: 17,598.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,699.99 : 29,950.34 = 12,750.39 : x
  2. Step 2: Convert to fraction form
    21,699.99/29,950.34 = 12,750.39/x
  3. Step 3: Cross multiply
    21,699.99x = 29,950.34 × 12,750.39
  4. Step 4: Simplify right side
    21,699.99x = 381,878,451.88
  5. Step 5: Solve for x
    x = 381,878,451.88/21,699.99
  6. Step 6: Final answer
    x = 17,598.09

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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.