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Finding the Fourth Proportional to 72,812.42, 100,480.93 and 40,981.31

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Solution

The fourth proportional to 72,812.42, 100,480.93 and 40,981.31 is: 56,554.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,812.42 : 100,480.93 = 40,981.31 : x
  2. Step 2: Convert to fraction form
    72,812.42/100,480.93 = 40,981.31/x
  3. Step 3: Cross multiply
    72,812.42x = 100,480.93 × 40,981.31
  4. Step 4: Simplify right side
    72,812.42x = 4,117,839,936.51
  5. Step 5: Solve for x
    x = 4,117,839,936.51/72,812.42
  6. Step 6: Final answer
    x = 56,554.09

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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.