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Finding the Fourth Proportional to 423,911.40, 636,903.90 and 318,935.40

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Solution

The fourth proportional to 423,911.40, 636,903.90 and 318,935.40 is: 479,183.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,911.40 : 636,903.90 = 318,935.40 : x
  2. Step 2: Convert to fraction form
    423,911.40/636,903.90 = 318,935.40/x
  3. Step 3: Cross multiply
    423,911.40x = 636,903.90 × 318,935.40
  4. Step 4: Simplify right side
    423,911.40x = 203,131,200,108.06
  5. Step 5: Solve for x
    x = 203,131,200,108.06/423,911.40
  6. Step 6: Final answer
    x = 479,183.15

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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.