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Finding the Fourth Proportional to 457,420.80, 686,131.20 and 308,121.60

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Solution

The fourth proportional to 457,420.80, 686,131.20 and 308,121.60 is: 462,182.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    457,420.80 : 686,131.20 = 308,121.60 : x
  2. Step 2: Convert to fraction form
    457,420.80/686,131.20 = 308,121.60/x
  3. Step 3: Cross multiply
    457,420.80x = 686,131.20 × 308,121.60
  4. Step 4: Simplify right side
    457,420.80x = 211,411,843,153.92
  5. Step 5: Solve for x
    x = 211,411,843,153.92/457,420.80
  6. Step 6: Final answer
    x = 462,182.40

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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.