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Finding the Fourth Proportional to 18,915.17, 28,372.76 and 18,887.84

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Solution

The fourth proportional to 18,915.17, 28,372.76 and 18,887.84 is: 28,331.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,915.17 : 28,372.76 = 18,887.84 : x
  2. Step 2: Convert to fraction form
    18,915.17/28,372.76 = 18,887.84/x
  3. Step 3: Cross multiply
    18,915.17x = 28,372.76 × 18,887.84
  4. Step 4: Simplify right side
    18,915.17x = 535,900,151.24
  5. Step 5: Solve for x
    x = 535,900,151.24/18,915.17
  6. Step 6: Final answer
    x = 28,331.76

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