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Finding the Fourth Proportional to 390,419.97, 585,699.41 and 137,847.10

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Solution

The fourth proportional to 390,419.97, 585,699.41 and 137,847.10 is: 206,795.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,419.97 : 585,699.41 = 137,847.10 : x
  2. Step 2: Convert to fraction form
    390,419.97/585,699.41 = 137,847.10/x
  3. Step 3: Cross multiply
    390,419.97x = 585,699.41 × 137,847.10
  4. Step 4: Simplify right side
    390,419.97x = 80,736,965,140.21
  5. Step 5: Solve for x
    x = 80,736,965,140.21/390,419.97
  6. Step 6: Final answer
    x = 206,795.17

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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.