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Finding the Fourth Proportional to 478,540.40, 718,879.80 and 399,808.40

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Solution

The fourth proportional to 478,540.40, 718,879.80 and 399,808.40 is: 600,605.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,540.40 : 718,879.80 = 399,808.40 : x
  2. Step 2: Convert to fraction form
    478,540.40/718,879.80 = 399,808.40/x
  3. Step 3: Cross multiply
    478,540.40x = 718,879.80 × 399,808.40
  4. Step 4: Simplify right side
    478,540.40x = 287,414,182,630.32
  5. Step 5: Solve for x
    x = 287,414,182,630.32/478,540.40
  6. Step 6: Final answer
    x = 600,605.89

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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.