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Finding the Fourth Proportional to 72,321.66, 99,814.37 and 40,492.61

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Solution

The fourth proportional to 72,321.66, 99,814.37 and 40,492.61 is: 55,885.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,321.66 : 99,814.37 = 40,492.61 : x
  2. Step 2: Convert to fraction form
    72,321.66/99,814.37 = 40,492.61/x
  3. Step 3: Cross multiply
    72,321.66x = 99,814.37 × 40,492.61
  4. Step 4: Simplify right side
    72,321.66x = 4,041,744,356.81
  5. Step 5: Solve for x
    x = 4,041,744,356.81/72,321.66
  6. Step 6: Final answer
    x = 55,885.67

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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.