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Finding the Fourth Proportional to 72,670.95, 100,285.29 and 40,839.78

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Solution

The fourth proportional to 72,670.95, 100,285.29 and 40,839.78 is: 56,358.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,670.95 : 100,285.29 = 40,839.78 : x
  2. Step 2: Convert to fraction form
    72,670.95/100,285.29 = 40,839.78/x
  3. Step 3: Cross multiply
    72,670.95x = 100,285.29 × 40,839.78
  4. Step 4: Simplify right side
    72,670.95x = 4,095,629,180.84
  5. Step 5: Solve for x
    x = 4,095,629,180.84/72,670.95
  6. Step 6: Final answer
    x = 56,358.55

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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.