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Finding the Fourth Proportional to 72,874.68, 109,434.90 and 69,133.56

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Solution

The fourth proportional to 72,874.68, 109,434.90 and 69,133.56 is: 103,816.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,874.68 : 109,434.90 = 69,133.56 : x
  2. Step 2: Convert to fraction form
    72,874.68/109,434.90 = 69,133.56/x
  3. Step 3: Cross multiply
    72,874.68x = 109,434.90 × 69,133.56
  4. Step 4: Simplify right side
    72,874.68x = 7,565,624,225.24
  5. Step 5: Solve for x
    x = 7,565,624,225.24/72,874.68
  6. Step 6: Final answer
    x = 103,816.91

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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.