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Finding the Fourth Proportional to 78,970.38, 108,908.58 and 65,520.33

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Solution

The fourth proportional to 78,970.38, 108,908.58 and 65,520.33 is: 90,359.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,970.38 : 108,908.58 = 65,520.33 : x
  2. Step 2: Convert to fraction form
    78,970.38/108,908.58 = 65,520.33/x
  3. Step 3: Cross multiply
    78,970.38x = 108,908.58 × 65,520.33
  4. Step 4: Simplify right side
    78,970.38x = 7,135,726,101.43
  5. Step 5: Solve for x
    x = 7,135,726,101.43/78,970.38
  6. Step 6: Final answer
    x = 90,359.53

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1.5x scale

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.