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Finding the Fourth Proportional to 78,359.70, 117,616.35 and 38,961.30

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Solution

The fourth proportional to 78,359.70, 117,616.35 and 38,961.30 is: 58,480.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,359.70 : 117,616.35 = 38,961.30 : x
  2. Step 2: Convert to fraction form
    78,359.70/117,616.35 = 38,961.30/x
  3. Step 3: Cross multiply
    78,359.70x = 117,616.35 × 38,961.30
  4. Step 4: Simplify right side
    78,359.70x = 4,582,485,897.26
  5. Step 5: Solve for x
    x = 4,582,485,897.26/78,359.70
  6. Step 6: Final answer
    x = 58,480.14

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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.