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Finding the Fourth Proportional to 72,768.09, 100,419.80 and 40,936.98

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Solution

The fourth proportional to 72,768.09, 100,419.80 and 40,936.98 is: 56,492.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,768.09 : 100,419.80 = 40,936.98 : x
  2. Step 2: Convert to fraction form
    72,768.09/100,419.80 = 40,936.98/x
  3. Step 3: Cross multiply
    72,768.09x = 100,419.80 × 40,936.98
  4. Step 4: Simplify right side
    72,768.09x = 4,110,883,139.52
  5. Step 5: Solve for x
    x = 4,110,883,139.52/72,768.09
  6. Step 6: Final answer
    x = 56,492.94

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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.