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Finding the Fourth Proportional to 21,529.80, 32,221.80 and 18,905.40

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Solution

The fourth proportional to 21,529.80, 32,221.80 and 18,905.40 is: 28,294.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,529.80 : 32,221.80 = 18,905.40 : x
  2. Step 2: Convert to fraction form
    21,529.80/32,221.80 = 18,905.40/x
  3. Step 3: Cross multiply
    21,529.80x = 32,221.80 × 18,905.40
  4. Step 4: Simplify right side
    21,529.80x = 609,166,017.72
  5. Step 5: Solve for x
    x = 609,166,017.72/21,529.80
  6. Step 6: Final answer
    x = 28,294.09

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.