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Finding the Fourth Proportional to 9,866.61, 13,615.96 and 5,390.43

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Solution

The fourth proportional to 9,866.61, 13,615.96 and 5,390.43 is: 7,438.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,866.61 : 13,615.96 = 5,390.43 : x
  2. Step 2: Convert to fraction form
    9,866.61/13,615.96 = 5,390.43/x
  3. Step 3: Cross multiply
    9,866.61x = 13,615.96 × 5,390.43
  4. Step 4: Simplify right side
    9,866.61x = 73,395,879.26
  5. Step 5: Solve for x
    x = 73,395,879.26/9,866.61
  6. Step 6: Final answer
    x = 7,438.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.