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Finding the Fourth Proportional to 14,615.28, 21,920.28 and 4,753.20

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Solution

The fourth proportional to 14,615.28, 21,920.28 and 4,753.20 is: 7,128.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,615.28 : 21,920.28 = 4,753.20 : x
  2. Step 2: Convert to fraction form
    14,615.28/21,920.28 = 4,753.20/x
  3. Step 3: Cross multiply
    14,615.28x = 21,920.28 × 4,753.20
  4. Step 4: Simplify right side
    14,615.28x = 104,191,474.90
  5. Step 5: Solve for x
    x = 104,191,474.90/14,615.28
  6. Step 6: Final answer
    x = 7,128.94

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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.