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Finding the Fourth Proportional to 21,905.90, 32,862.48 and 7,111.70

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Solution

The fourth proportional to 21,905.90, 32,862.48 and 7,111.70 is: 10,668.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,905.90 : 32,862.48 = 7,111.70 : x
  2. Step 2: Convert to fraction form
    21,905.90/32,862.48 = 7,111.70/x
  3. Step 3: Cross multiply
    21,905.90x = 32,862.48 × 7,111.70
  4. Step 4: Simplify right side
    21,905.90x = 233,708,099.02
  5. Step 5: Solve for x
    x = 233,708,099.02/21,905.90
  6. Step 6: Final answer
    x = 10,668.73

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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.