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Finding the Fourth Proportional to 11,558.40, 17,318.40 and 9,907.20

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Solution

The fourth proportional to 11,558.40, 17,318.40 and 9,907.20 is: 14,844.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,558.40 : 17,318.40 = 9,907.20 : x
  2. Step 2: Convert to fraction form
    11,558.40/17,318.40 = 9,907.20/x
  3. Step 3: Cross multiply
    11,558.40x = 17,318.40 × 9,907.20
  4. Step 4: Simplify right side
    11,558.40x = 171,576,852.48
  5. Step 5: Solve for x
    x = 171,576,852.48/11,558.40
  6. Step 6: Final answer
    x = 14,844.34

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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.