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Finding the Fourth Proportional to 390,486.47, 585,519.14 and 210,668.27

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Solution

The fourth proportional to 390,486.47, 585,519.14 and 210,668.27 is: 315,888.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,486.47 : 585,519.14 = 210,668.27 : x
  2. Step 2: Convert to fraction form
    390,486.47/585,519.14 = 210,668.27/x
  3. Step 3: Cross multiply
    390,486.47x = 585,519.14 × 210,668.27
  4. Step 4: Simplify right side
    390,486.47x = 123,350,301,874.76
  5. Step 5: Solve for x
    x = 123,350,301,874.76/390,486.47
  6. Step 6: Final answer
    x = 315,888.80

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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.