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Finding the Fourth Proportional to 666,289.90, 919,480.21 and 375,963.09

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Solution

The fourth proportional to 666,289.90, 919,480.21 and 375,963.09 is: 518,829.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,289.90 : 919,480.21 = 375,963.09 : x
  2. Step 2: Convert to fraction form
    666,289.90/919,480.21 = 375,963.09/x
  3. Step 3: Cross multiply
    666,289.90x = 919,480.21 × 375,963.09
  4. Step 4: Simplify right side
    666,289.90x = 345,690,614,468.23
  5. Step 5: Solve for x
    x = 345,690,614,468.23/666,289.90
  6. Step 6: Final answer
    x = 518,829.14

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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.