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Finding the Fourth Proportional to 639,355.80, 958,688.10 and 265,416.60

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Solution

The fourth proportional to 639,355.80, 958,688.10 and 265,416.60 is: 397,981.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,355.80 : 958,688.10 = 265,416.60 : x
  2. Step 2: Convert to fraction form
    639,355.80/958,688.10 = 265,416.60/x
  3. Step 3: Cross multiply
    639,355.80x = 958,688.10 × 265,416.60
  4. Step 4: Simplify right side
    639,355.80x = 254,451,735,962.46
  5. Step 5: Solve for x
    x = 254,451,735,962.46/639,355.80
  6. Step 6: Final answer
    x = 397,981.43

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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.