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Finding the Fourth Proportional to 423,964.40, 636,983.40 and 318,988.40

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Solution

The fourth proportional to 423,964.40, 636,983.40 and 318,988.40 is: 479,262.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,964.40 : 636,983.40 = 318,988.40 : x
  2. Step 2: Convert to fraction form
    423,964.40/636,983.40 = 318,988.40/x
  3. Step 3: Cross multiply
    423,964.40x = 636,983.40 × 318,988.40
  4. Step 4: Simplify right side
    423,964.40x = 203,190,315,592.56
  5. Step 5: Solve for x
    x = 203,190,315,592.56/423,964.40
  6. Step 6: Final answer
    x = 479,262.68

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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.