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Finding the Fourth Proportional to 21,910.40, 32,905.20 and 19,188.80

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Solution

The fourth proportional to 21,910.40, 32,905.20 and 19,188.80 is: 28,817.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,910.40 : 32,905.20 = 19,188.80 : x
  2. Step 2: Convert to fraction form
    21,910.40/32,905.20 = 19,188.80/x
  3. Step 3: Cross multiply
    21,910.40x = 32,905.20 × 19,188.80
  4. Step 4: Simplify right side
    21,910.40x = 631,411,301.76
  5. Step 5: Solve for x
    x = 631,411,301.76/21,910.40
  6. Step 6: Final answer
    x = 28,817.88

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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.