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Finding the Fourth Proportional to 431,255.40, 646,883.10 and 393,930.60

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Solution

The fourth proportional to 431,255.40, 646,883.10 and 393,930.60 is: 590,895.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,255.40 : 646,883.10 = 393,930.60 : x
  2. Step 2: Convert to fraction form
    431,255.40/646,883.10 = 393,930.60/x
  3. Step 3: Cross multiply
    431,255.40x = 646,883.10 × 393,930.60
  4. Step 4: Simplify right side
    431,255.40x = 254,827,047,712.86
  5. Step 5: Solve for x
    x = 254,827,047,712.86/431,255.40
  6. Step 6: Final answer
    x = 590,895.90

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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.