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Finding the Fourth Proportional to 78,538.40, 117,548.40 and 60,912.80

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Solution

The fourth proportional to 78,538.40, 117,548.40 and 60,912.80 is: 91,168.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,538.40 : 117,548.40 = 60,912.80 : x
  2. Step 2: Convert to fraction form
    78,538.40/117,548.40 = 60,912.80/x
  3. Step 3: Cross multiply
    78,538.40x = 117,548.40 × 60,912.80
  4. Step 4: Simplify right side
    78,538.40x = 7,160,202,179.52
  5. Step 5: Solve for x
    x = 7,160,202,179.52/78,538.40
  6. Step 6: Final answer
    x = 91,168.17

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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.