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Finding the Fourth Proportional to 72,521.63, 100,081.57 and 40,692.88

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Solution

The fourth proportional to 72,521.63, 100,081.57 and 40,692.88 is: 56,157.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,521.63 : 100,081.57 = 40,692.88 : x
  2. Step 2: Convert to fraction form
    72,521.63/100,081.57 = 40,692.88/x
  3. Step 3: Cross multiply
    72,521.63x = 100,081.57 × 40,692.88
  4. Step 4: Simplify right side
    72,521.63x = 4,072,606,928.14
  5. Step 5: Solve for x
    x = 4,072,606,928.14/72,521.63
  6. Step 6: Final answer
    x = 56,157.14

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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.