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Finding the Fourth Proportional to 390,301.45, 585,053.39 and 221,465.12

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Solution

The fourth proportional to 390,301.45, 585,053.39 and 221,465.12 is: 331,971.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,301.45 : 585,053.39 = 221,465.12 : x
  2. Step 2: Convert to fraction form
    390,301.45/585,053.39 = 221,465.12/x
  3. Step 3: Cross multiply
    390,301.45x = 585,053.39 × 221,465.12
  4. Step 4: Simplify right side
    390,301.45x = 129,568,916,851.15
  5. Step 5: Solve for x
    x = 129,568,916,851.15/390,301.45
  6. Step 6: Final answer
    x = 331,971.40

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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.