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Finding the Fourth Proportional to 21,170.99, 29,218.37 and 12,220.89

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Solution

The fourth proportional to 21,170.99, 29,218.37 and 12,220.89 is: 16,866.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,170.99 : 29,218.37 = 12,220.89 : x
  2. Step 2: Convert to fraction form
    21,170.99/29,218.37 = 12,220.89/x
  3. Step 3: Cross multiply
    21,170.99x = 29,218.37 × 12,220.89
  4. Step 4: Simplify right side
    21,170.99x = 357,074,424.64
  5. Step 5: Solve for x
    x = 357,074,424.64/21,170.99
  6. Step 6: Final answer
    x = 16,866.22

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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.