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Finding the Fourth Proportional to 8,915.63, 13,378.05 and 3,921.53

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Solution

The fourth proportional to 8,915.63, 13,378.05 and 3,921.53 is: 5,884.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,915.63 : 13,378.05 = 3,921.53 : x
  2. Step 2: Convert to fraction form
    8,915.63/13,378.05 = 3,921.53/x
  3. Step 3: Cross multiply
    8,915.63x = 13,378.05 × 3,921.53
  4. Step 4: Simplify right side
    8,915.63x = 52,462,357.53
  5. Step 5: Solve for x
    x = 52,462,357.53/8,915.63
  6. Step 6: Final answer
    x = 5,884.32

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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.