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Finding the Fourth Proportional to 21,690.68, 29,933.84 and 12,259.84

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Solution

The fourth proportional to 21,690.68, 29,933.84 and 12,259.84 is: 16,918.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,690.68 : 29,933.84 = 12,259.84 : x
  2. Step 2: Convert to fraction form
    21,690.68/29,933.84 = 12,259.84/x
  3. Step 3: Cross multiply
    21,690.68x = 29,933.84 × 12,259.84
  4. Step 4: Simplify right side
    21,690.68x = 366,984,088.99
  5. Step 5: Solve for x
    x = 366,984,088.99/21,690.68
  6. Step 6: Final answer
    x = 16,918.98

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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.