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Finding the Fourth Proportional to 661,242.44, 911,669.80 and 428,257.73

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Solution

The fourth proportional to 661,242.44, 911,669.80 and 428,257.73 is: 590,448.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,242.44 : 911,669.80 = 428,257.73 : x
  2. Step 2: Convert to fraction form
    661,242.44/911,669.80 = 428,257.73/x
  3. Step 3: Cross multiply
    661,242.44x = 911,669.80 × 428,257.73
  4. Step 4: Simplify right side
    661,242.44x = 390,429,641,069.07
  5. Step 5: Solve for x
    x = 390,429,641,069.07/661,242.44
  6. Step 6: Final answer
    x = 590,448.55

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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.