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Finding the Fourth Proportional to 426,989.35, 639,966.13 and 313,618.34

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Solution

The fourth proportional to 426,989.35, 639,966.13 and 313,618.34 is: 470,047.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,989.35 : 639,966.13 = 313,618.34 : x
  2. Step 2: Convert to fraction form
    426,989.35/639,966.13 = 313,618.34/x
  3. Step 3: Cross multiply
    426,989.35x = 639,966.13 × 313,618.34
  4. Step 4: Simplify right side
    426,989.35x = 200,705,115,346.82
  5. Step 5: Solve for x
    x = 200,705,115,346.82/426,989.35
  6. Step 6: Final answer
    x = 470,047.12

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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.