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Finding the Fourth Proportional to 420,379.35, 630,818.25 and 393,781.19

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Solution

The fourth proportional to 420,379.35, 630,818.25 and 393,781.19 is: 590,905.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,379.35 : 630,818.25 = 393,781.19 : x
  2. Step 2: Convert to fraction form
    420,379.35/630,818.25 = 393,781.19/x
  3. Step 3: Cross multiply
    420,379.35x = 630,818.25 × 393,781.19
  4. Step 4: Simplify right side
    420,379.35x = 248,404,358,004.63
  5. Step 5: Solve for x
    x = 248,404,358,004.63/420,379.35
  6. Step 6: Final answer
    x = 590,905.23

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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.