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Finding the Fourth Proportional to 132,693.88, 183,118.08 and 78,978.64

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Solution

The fourth proportional to 132,693.88, 183,118.08 and 78,978.64 is: 108,990.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    132,693.88 : 183,118.08 = 78,978.64 : x
  2. Step 2: Convert to fraction form
    132,693.88/183,118.08 = 78,978.64/x
  3. Step 3: Cross multiply
    132,693.88x = 183,118.08 × 78,978.64
  4. Step 4: Simplify right side
    132,693.88x = 14,462,416,917.81
  5. Step 5: Solve for x
    x = 14,462,416,917.81/132,693.88
  6. Step 6: Final answer
    x = 108,990.84

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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.