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Finding the Fourth Proportional to 458,486.40, 687,729.60 and 142,940.80

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Solution

The fourth proportional to 458,486.40, 687,729.60 and 142,940.80 is: 214,411.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,486.40 : 687,729.60 = 142,940.80 : x
  2. Step 2: Convert to fraction form
    458,486.40/687,729.60 = 142,940.80/x
  3. Step 3: Cross multiply
    458,486.40x = 687,729.60 × 142,940.80
  4. Step 4: Simplify right side
    458,486.40x = 98,304,619,207.68
  5. Step 5: Solve for x
    x = 98,304,619,207.68/458,486.40
  6. Step 6: Final answer
    x = 214,411.20

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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.