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Finding the Fourth Proportional to 485,705.40, 728,558.10 and 343,987.80

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Solution

The fourth proportional to 485,705.40, 728,558.10 and 343,987.80 is: 515,981.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,705.40 : 728,558.10 = 343,987.80 : x
  2. Step 2: Convert to fraction form
    485,705.40/728,558.10 = 343,987.80/x
  3. Step 3: Cross multiply
    485,705.40x = 728,558.10 × 343,987.80
  4. Step 4: Simplify right side
    485,705.40x = 250,615,097,991.18
  5. Step 5: Solve for x
    x = 250,615,097,991.18/485,705.40
  6. Step 6: Final answer
    x = 515,981.70

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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.