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Finding the Fourth Proportional to 489,138.40, 733,707.60 and 431,401.60

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Solution

The fourth proportional to 489,138.40, 733,707.60 and 431,401.60 is: 647,102.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,138.40 : 733,707.60 = 431,401.60 : x
  2. Step 2: Convert to fraction form
    489,138.40/733,707.60 = 431,401.60/x
  3. Step 3: Cross multiply
    489,138.40x = 733,707.60 × 431,401.60
  4. Step 4: Simplify right side
    489,138.40x = 316,522,632,572.16
  5. Step 5: Solve for x
    x = 316,522,632,572.16/489,138.40
  6. Step 6: Final answer
    x = 647,102.40

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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.