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Finding the Fourth Proportional to 393,608.20, 590,412.30 and 156,987.40

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Solution

The fourth proportional to 393,608.20, 590,412.30 and 156,987.40 is: 235,481.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,608.20 : 590,412.30 = 156,987.40 : x
  2. Step 2: Convert to fraction form
    393,608.20/590,412.30 = 156,987.40/x
  3. Step 3: Cross multiply
    393,608.20x = 590,412.30 × 156,987.40
  4. Step 4: Simplify right side
    393,608.20x = 92,687,291,905.02
  5. Step 5: Solve for x
    x = 92,687,291,905.02/393,608.20
  6. Step 6: Final answer
    x = 235,481.10

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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.