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Finding the Fourth Proportional to 78,480.28, 117,720.42 and 54,860.68

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Solution

The fourth proportional to 78,480.28, 117,720.42 and 54,860.68 is: 82,291.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,480.28 : 117,720.42 = 54,860.68 : x
  2. Step 2: Convert to fraction form
    78,480.28/117,720.42 = 54,860.68/x
  3. Step 3: Cross multiply
    78,480.28x = 117,720.42 × 54,860.68
  4. Step 4: Simplify right side
    78,480.28x = 6,458,221,428.18
  5. Step 5: Solve for x
    x = 6,458,221,428.18/78,480.28
  6. Step 6: Final answer
    x = 82,291.01

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Similar ratio
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1.5x scale

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.