Home / 21,805.40-30,088.87-12,245.78

Finding the Fourth Proportional to 21,805.40, 30,088.87 and 12,245.78

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Solution

The fourth proportional to 21,805.40, 30,088.87 and 12,245.78 is: 16,897.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,805.40 : 30,088.87 = 12,245.78 : x
  2. Step 2: Convert to fraction form
    21,805.40/30,088.87 = 12,245.78/x
  3. Step 3: Cross multiply
    21,805.40x = 30,088.87 × 12,245.78
  4. Step 4: Simplify right side
    21,805.40x = 368,461,727.08
  5. Step 5: Solve for x
    x = 368,461,727.08/21,805.40
  6. Step 6: Final answer
    x = 16,897.73

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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.