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Finding the Fourth Proportional to 121,880.28, 168,164.46 and 76,565.64

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Solution

The fourth proportional to 121,880.28, 168,164.46 and 76,565.64 is: 105,641.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,880.28 : 168,164.46 = 76,565.64 : x
  2. Step 2: Convert to fraction form
    121,880.28/168,164.46 = 76,565.64/x
  3. Step 3: Cross multiply
    121,880.28x = 168,164.46 × 76,565.64
  4. Step 4: Simplify right side
    121,880.28x = 12,875,619,505.15
  5. Step 5: Solve for x
    x = 12,875,619,505.15/121,880.28
  6. Step 6: Final answer
    x = 105,641.53

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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.