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Finding the Fourth Proportional to 13,915.60, 20,887.98 and 7,340.02

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Solution

The fourth proportional to 13,915.60, 20,887.98 and 7,340.02 is: 11,017.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,915.60 : 20,887.98 = 7,340.02 : x
  2. Step 2: Convert to fraction form
    13,915.60/20,887.98 = 7,340.02/x
  3. Step 3: Cross multiply
    13,915.60x = 20,887.98 × 7,340.02
  4. Step 4: Simplify right side
    13,915.60x = 153,318,190.96
  5. Step 5: Solve for x
    x = 153,318,190.96/13,915.60
  6. Step 6: Final answer
    x = 11,017.72

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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.