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Finding the Fourth Proportional to 72,665.28, 100,274.86 and 42,453.40

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Solution

The fourth proportional to 72,665.28, 100,274.86 and 42,453.40 is: 58,583.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,665.28 : 100,274.86 = 42,453.40 : x
  2. Step 2: Convert to fraction form
    72,665.28/100,274.86 = 42,453.40/x
  3. Step 3: Cross multiply
    72,665.28x = 100,274.86 × 42,453.40
  4. Step 4: Simplify right side
    72,665.28x = 4,257,008,741.52
  5. Step 5: Solve for x
    x = 4,257,008,741.52/72,665.28
  6. Step 6: Final answer
    x = 58,583.81

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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.