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Finding the Fourth Proportional to 12,889.28, 19,335.04 and 3,655.28

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Solution

The fourth proportional to 12,889.28, 19,335.04 and 3,655.28 is: 5,483.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,889.28 : 19,335.04 = 3,655.28 : x
  2. Step 2: Convert to fraction form
    12,889.28/19,335.04 = 3,655.28/x
  3. Step 3: Cross multiply
    12,889.28x = 19,335.04 × 3,655.28
  4. Step 4: Simplify right side
    12,889.28x = 70,674,985.01
  5. Step 5: Solve for x
    x = 70,674,985.01/12,889.28
  6. Step 6: Final answer
    x = 5,483.24

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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.