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Finding the Fourth Proportional to 258,516.56, 387,775.05 and 81,037.40

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Solution

The fourth proportional to 258,516.56, 387,775.05 and 81,037.40 is: 121,556.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,516.56 : 387,775.05 = 81,037.40 : x
  2. Step 2: Convert to fraction form
    258,516.56/387,775.05 = 81,037.40/x
  3. Step 3: Cross multiply
    258,516.56x = 387,775.05 × 81,037.40
  4. Step 4: Simplify right side
    258,516.56x = 31,424,281,836.87
  5. Step 5: Solve for x
    x = 31,424,281,836.87/258,516.56
  6. Step 6: Final answer
    x = 121,556.17

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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.