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Finding the Fourth Proportional to 72,935.52, 109,409.40 and 20,345.64

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Solution

The fourth proportional to 72,935.52, 109,409.40 and 20,345.64 is: 30,520.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,935.52 : 109,409.40 = 20,345.64 : x
  2. Step 2: Convert to fraction form
    72,935.52/109,409.40 = 20,345.64/x
  3. Step 3: Cross multiply
    72,935.52x = 109,409.40 × 20,345.64
  4. Step 4: Simplify right side
    72,935.52x = 2,226,004,265.02
  5. Step 5: Solve for x
    x = 2,226,004,265.02/72,935.52
  6. Step 6: Final answer
    x = 30,520.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.