Home / 21,943.96-30,280.98-12,990.76

Finding the Fourth Proportional to 21,943.96, 30,280.98 and 12,990.76

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Solution

The fourth proportional to 21,943.96, 30,280.98 and 12,990.76 is: 17,926.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,943.96 : 30,280.98 = 12,990.76 : x
  2. Step 2: Convert to fraction form
    21,943.96/30,280.98 = 12,990.76/x
  3. Step 3: Cross multiply
    21,943.96x = 30,280.98 × 12,990.76
  4. Step 4: Simplify right side
    21,943.96x = 393,372,943.74
  5. Step 5: Solve for x
    x = 393,372,943.74/21,943.96
  6. Step 6: Final answer
    x = 17,926.25

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Double scale
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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.