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Finding the Fourth Proportional to 70,145.28, 105,218.88 and 39,177.60

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Solution

The fourth proportional to 70,145.28, 105,218.88 and 39,177.60 is: 58,766.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,145.28 : 105,218.88 = 39,177.60 : x
  2. Step 2: Convert to fraction form
    70,145.28/105,218.88 = 39,177.60/x
  3. Step 3: Cross multiply
    70,145.28x = 105,218.88 × 39,177.60
  4. Step 4: Simplify right side
    70,145.28x = 4,122,223,193.09
  5. Step 5: Solve for x
    x = 4,122,223,193.09/70,145.28
  6. Step 6: Final answer
    x = 58,766.94

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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.