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Finding the Fourth Proportional to 717,267.36, 989,835.42 and 394,978.74

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Solution

The fourth proportional to 717,267.36, 989,835.42 and 394,978.74 is: 545,074.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,267.36 : 989,835.42 = 394,978.74 : x
  2. Step 2: Convert to fraction form
    717,267.36/989,835.42 = 394,978.74/x
  3. Step 3: Cross multiply
    717,267.36x = 989,835.42 × 394,978.74
  4. Step 4: Simplify right side
    717,267.36x = 390,963,946,998.97
  5. Step 5: Solve for x
    x = 390,963,946,998.97/717,267.36
  6. Step 6: Final answer
    x = 545,074.22

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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.