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Finding the Fourth Proportional to 405,121.20, 607,681.80 and 330,325.80

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Solution

The fourth proportional to 405,121.20, 607,681.80 and 330,325.80 is: 495,488.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,121.20 : 607,681.80 = 330,325.80 : x
  2. Step 2: Convert to fraction form
    405,121.20/607,681.80 = 330,325.80/x
  3. Step 3: Cross multiply
    405,121.20x = 607,681.80 × 330,325.80
  4. Step 4: Simplify right side
    405,121.20x = 200,732,976,730.44
  5. Step 5: Solve for x
    x = 200,732,976,730.44/405,121.20
  6. Step 6: Final answer
    x = 495,488.70

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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.