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Finding the Fourth Proportional to 21,871.60, 30,182.80 and 11,935.60

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Solution

The fourth proportional to 21,871.60, 30,182.80 and 11,935.60 is: 16,471.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,871.60 : 30,182.80 = 11,935.60 : x
  2. Step 2: Convert to fraction form
    21,871.60/30,182.80 = 11,935.60/x
  3. Step 3: Cross multiply
    21,871.60x = 30,182.80 × 11,935.60
  4. Step 4: Simplify right side
    21,871.60x = 360,249,827.68
  5. Step 5: Solve for x
    x = 360,249,827.68/21,871.60
  6. Step 6: Final answer
    x = 16,471.12

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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.