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Finding the Fourth Proportional to 439,874.80, 659,812.20 and 390,011.20

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Solution

The fourth proportional to 439,874.80, 659,812.20 and 390,011.20 is: 585,016.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    439,874.80 : 659,812.20 = 390,011.20 : x
  2. Step 2: Convert to fraction form
    439,874.80/659,812.20 = 390,011.20/x
  3. Step 3: Cross multiply
    439,874.80x = 659,812.20 × 390,011.20
  4. Step 4: Simplify right side
    439,874.80x = 257,334,147,896.64
  5. Step 5: Solve for x
    x = 257,334,147,896.64/439,874.80
  6. Step 6: Final answer
    x = 585,016.80

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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.