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Finding the Fourth Proportional to 72,670.45, 100,284.59 and 40,839.28

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Solution

The fourth proportional to 72,670.45, 100,284.59 and 40,839.28 is: 56,357.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,670.45 : 100,284.59 = 40,839.28 : x
  2. Step 2: Convert to fraction form
    72,670.45/100,284.59 = 40,839.28/x
  3. Step 3: Cross multiply
    72,670.45x = 100,284.59 × 40,839.28
  4. Step 4: Simplify right side
    72,670.45x = 4,095,550,450.70
  5. Step 5: Solve for x
    x = 4,095,550,450.70/72,670.45
  6. Step 6: Final answer
    x = 56,357.85

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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.