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Finding the Fourth Proportional to 21,905.40, 32,861.73 and 7,111.20

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Solution

The fourth proportional to 21,905.40, 32,861.73 and 7,111.20 is: 10,667.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,905.40 : 32,861.73 = 7,111.20 : x
  2. Step 2: Convert to fraction form
    21,905.40/32,861.73 = 7,111.20/x
  3. Step 3: Cross multiply
    21,905.40x = 32,861.73 × 7,111.20
  4. Step 4: Simplify right side
    21,905.40x = 233,686,334.38
  5. Step 5: Solve for x
    x = 233,686,334.38/21,905.40
  6. Step 6: Final answer
    x = 10,667.98

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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.