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Finding the Fourth Proportional to 390,489.99, 585,066.33 and 213,121.47

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Solution

The fourth proportional to 390,489.99, 585,066.33 and 213,121.47 is: 319,317.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,489.99 : 585,066.33 = 213,121.47 : x
  2. Step 2: Convert to fraction form
    390,489.99/585,066.33 = 213,121.47/x
  3. Step 3: Cross multiply
    390,489.99x = 585,066.33 × 213,121.47
  4. Step 4: Simplify right side
    390,489.99x = 124,690,196,297.11
  5. Step 5: Solve for x
    x = 124,690,196,297.11/390,489.99
  6. Step 6: Final answer
    x = 319,317.27

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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.