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Finding the Fourth Proportional to 641,714.40, 961,405.20 and 392,104.80

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Solution

The fourth proportional to 641,714.40, 961,405.20 and 392,104.80 is: 587,444.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,714.40 : 961,405.20 = 392,104.80 : x
  2. Step 2: Convert to fraction form
    641,714.40/961,405.20 = 392,104.80/x
  3. Step 3: Cross multiply
    641,714.40x = 961,405.20 × 392,104.80
  4. Step 4: Simplify right side
    641,714.40x = 376,971,593,664.96
  5. Step 5: Solve for x
    x = 376,971,593,664.96/641,714.40
  6. Step 6: Final answer
    x = 587,444.50

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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.