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Finding the Fourth Proportional to 431,138.40, 646,707.60 and 331,490.40

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Solution

The fourth proportional to 431,138.40, 646,707.60 and 331,490.40 is: 497,235.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,138.40 : 646,707.60 = 331,490.40 : x
  2. Step 2: Convert to fraction form
    431,138.40/646,707.60 = 331,490.40/x
  3. Step 3: Cross multiply
    431,138.40x = 646,707.60 × 331,490.40
  4. Step 4: Simplify right side
    431,138.40x = 214,377,361,007.04
  5. Step 5: Solve for x
    x = 214,377,361,007.04/431,138.40
  6. Step 6: Final answer
    x = 497,235.60

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1.5x scale

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.