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Finding the Fourth Proportional to 72,738.59, 100,378.35 and 40,912.88

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Solution

The fourth proportional to 72,738.59, 100,378.35 and 40,912.88 is: 56,459.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,738.59 : 100,378.35 = 40,912.88 : x
  2. Step 2: Convert to fraction form
    72,738.59/100,378.35 = 40,912.88/x
  3. Step 3: Cross multiply
    72,738.59x = 100,378.35 × 40,912.88
  4. Step 4: Simplify right side
    72,738.59x = 4,106,766,886.26
  5. Step 5: Solve for x
    x = 4,106,766,886.26/72,738.59
  6. Step 6: Final answer
    x = 56,459.26

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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.