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Finding the Fourth Proportional to 86,320, 128,874.47 and 73,037.56

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Solution

The fourth proportional to 86,320, 128,874.47 and 73,037.56 is: 109,043.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,320 : 128,874.47 = 73,037.56 : x
  2. Step 2: Convert to fraction form
    86,320/128,874.47 = 73,037.56/x
  3. Step 3: Cross multiply
    86,320x = 128,874.47 × 73,037.56
  4. Step 4: Simplify right side
    86,320x = 9,412,676,835.09
  5. Step 5: Solve for x
    x = 9,412,676,835.09/86,320
  6. Step 6: Final answer
    x = 109,043.99

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.