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Finding the Fourth Proportional to 72,728.50, 100,365.94 and 40,897.12

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Solution

The fourth proportional to 72,728.50, 100,365.94 and 40,897.12 is: 56,438.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,728.50 : 100,365.94 = 40,897.12 : x
  2. Step 2: Convert to fraction form
    72,728.50/100,365.94 = 40,897.12/x
  3. Step 3: Cross multiply
    72,728.50x = 100,365.94 × 40,897.12
  4. Step 4: Simplify right side
    72,728.50x = 4,104,677,892.09
  5. Step 5: Solve for x
    x = 4,104,677,892.09/72,728.50
  6. Step 6: Final answer
    x = 56,438.37

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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.