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Finding the Fourth Proportional to 72,773.28, 100,428.71 and 40,509.56

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Solution

The fourth proportional to 72,773.28, 100,428.71 and 40,509.56 is: 55,904.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,773.28 : 100,428.71 = 40,509.56 : x
  2. Step 2: Convert to fraction form
    72,773.28/100,428.71 = 40,509.56/x
  3. Step 3: Cross multiply
    72,773.28x = 100,428.71 × 40,509.56
  4. Step 4: Simplify right side
    72,773.28x = 4,068,322,901.99
  5. Step 5: Solve for x
    x = 4,068,322,901.99/72,773.28
  6. Step 6: Final answer
    x = 55,904.07

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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.