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Finding the Fourth Proportional to 10,915.60, 16,389.60 and 7,643.20

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Solution

The fourth proportional to 10,915.60, 16,389.60 and 7,643.20 is: 11,476.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,915.60 : 16,389.60 = 7,643.20 : x
  2. Step 2: Convert to fraction form
    10,915.60/16,389.60 = 7,643.20/x
  3. Step 3: Cross multiply
    10,915.60x = 16,389.60 × 7,643.20
  4. Step 4: Simplify right side
    10,915.60x = 125,268,990.72
  5. Step 5: Solve for x
    x = 125,268,990.72/10,915.60
  6. Step 6: Final answer
    x = 11,476.14

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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.