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Finding the Fourth Proportional to 78,489.64, 108,339.42 and 53,353.72

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Solution

The fourth proportional to 78,489.64, 108,339.42 and 53,353.72 is: 73,644.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,489.64 : 108,339.42 = 53,353.72 : x
  2. Step 2: Convert to fraction form
    78,489.64/108,339.42 = 53,353.72/x
  3. Step 3: Cross multiply
    78,489.64x = 108,339.42 × 53,353.72
  4. Step 4: Simplify right side
    78,489.64x = 5,780,311,079.64
  5. Step 5: Solve for x
    x = 5,780,311,079.64/78,489.64
  6. Step 6: Final answer
    x = 73,644.26

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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.