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Finding the Fourth Proportional to 283,139.73, 390,732.90 and 155,815.33

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Solution

The fourth proportional to 283,139.73, 390,732.90 and 155,815.33 is: 215,025.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    283,139.73 : 390,732.90 = 155,815.33 : x
  2. Step 2: Convert to fraction form
    283,139.73/390,732.90 = 155,815.33/x
  3. Step 3: Cross multiply
    283,139.73x = 390,732.90 × 155,815.33
  4. Step 4: Simplify right side
    283,139.73x = 60,882,173,217.39
  5. Step 5: Solve for x
    x = 60,882,173,217.39/283,139.73
  6. Step 6: Final answer
    x = 215,025.19

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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.