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Finding the Fourth Proportional to 423,879.40, 636,855.90 and 318,903.40

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Solution

The fourth proportional to 423,879.40, 636,855.90 and 318,903.40 is: 479,135.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,879.40 : 636,855.90 = 318,903.40 : x
  2. Step 2: Convert to fraction form
    423,879.40/636,855.90 = 318,903.40/x
  3. Step 3: Cross multiply
    423,879.40x = 636,855.90 × 318,903.40
  4. Step 4: Simplify right side
    423,879.40x = 203,095,511,820.06
  5. Step 5: Solve for x
    x = 203,095,511,820.06/423,879.40
  6. Step 6: Final answer
    x = 479,135.13

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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.