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Finding the Fourth Proportional to 420,379.32, 630,818.12 and 393,781.16

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Solution

The fourth proportional to 420,379.32, 630,818.12 and 393,781.16 is: 590,905.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,379.32 : 630,818.12 = 393,781.16 : x
  2. Step 2: Convert to fraction form
    420,379.32/630,818.12 = 393,781.16/x
  3. Step 3: Cross multiply
    420,379.32x = 630,818.12 × 393,781.16
  4. Step 4: Simplify right side
    420,379.32x = 248,404,291,042.62
  5. Step 5: Solve for x
    x = 248,404,291,042.62/420,379.32
  6. Step 6: Final answer
    x = 590,905.12

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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.