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Finding the Fourth Proportional to 72,000.76, 99,361.34 and 40,171

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Solution

The fourth proportional to 72,000.76, 99,361.34 and 40,171 is: 55,436.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,000.76 : 99,361.34 = 40,171 : x
  2. Step 2: Convert to fraction form
    72,000.76/99,361.34 = 40,171/x
  3. Step 3: Cross multiply
    72,000.76x = 99,361.34 × 40,171
  4. Step 4: Simplify right side
    72,000.76x = 3,991,444,188.29
  5. Step 5: Solve for x
    x = 3,991,444,188.29/72,000.76
  6. Step 6: Final answer
    x = 55,436.14

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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.