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Finding the Fourth Proportional to 21,898.80, 30,220.43 and 12,338.81

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Solution

The fourth proportional to 21,898.80, 30,220.43 and 12,338.81 is: 17,027.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,898.80 : 30,220.43 = 12,338.81 : x
  2. Step 2: Convert to fraction form
    21,898.80/30,220.43 = 12,338.81/x
  3. Step 3: Cross multiply
    21,898.80x = 30,220.43 × 12,338.81
  4. Step 4: Simplify right side
    21,898.80x = 372,883,931.09
  5. Step 5: Solve for x
    x = 372,883,931.09/21,898.80
  6. Step 6: Final answer
    x = 17,027.60

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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.