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Finding the Fourth Proportional to 660,698.79, 911,749.03 and 385,039.09

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Solution

The fourth proportional to 660,698.79, 911,749.03 and 385,039.09 is: 531,345.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,698.79 : 911,749.03 = 385,039.09 : x
  2. Step 2: Convert to fraction form
    660,698.79/911,749.03 = 385,039.09/x
  3. Step 3: Cross multiply
    660,698.79x = 911,749.03 × 385,039.09
  4. Step 4: Simplify right side
    660,698.79x = 351,059,016,819.58
  5. Step 5: Solve for x
    x = 351,059,016,819.58/660,698.79
  6. Step 6: Final answer
    x = 531,345.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.