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Finding the Fourth Proportional to 630,438.38, 870,003.78 and 343,958.66

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Solution

The fourth proportional to 630,438.38, 870,003.78 and 343,958.66 is: 474,662.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    630,438.38 : 870,003.78 = 343,958.66 : x
  2. Step 2: Convert to fraction form
    630,438.38/870,003.78 = 343,958.66/x
  3. Step 3: Cross multiply
    630,438.38x = 870,003.78 × 343,958.66
  4. Step 4: Simplify right side
    630,438.38x = 299,245,334,363.74
  5. Step 5: Solve for x
    x = 299,245,334,363.74/630,438.38
  6. Step 6: Final answer
    x = 474,662.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.