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Finding the Fourth Proportional to 440,143.20, 660,214.80 and 389,404.80

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Solution

The fourth proportional to 440,143.20, 660,214.80 and 389,404.80 is: 584,107.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    440,143.20 : 660,214.80 = 389,404.80 : x
  2. Step 2: Convert to fraction form
    440,143.20/660,214.80 = 389,404.80/x
  3. Step 3: Cross multiply
    440,143.20x = 660,214.80 × 389,404.80
  4. Step 4: Simplify right side
    440,143.20x = 257,090,812,151.04
  5. Step 5: Solve for x
    x = 257,090,812,151.04/440,143.20
  6. Step 6: Final answer
    x = 584,107.20

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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.