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Finding the Fourth Proportional to 328,309.30, 492,099.45 and 128,563.30

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Solution

The fourth proportional to 328,309.30, 492,099.45 and 128,563.30 is: 192,702.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,309.30 : 492,099.45 = 128,563.30 : x
  2. Step 2: Convert to fraction form
    328,309.30/492,099.45 = 128,563.30/x
  3. Step 3: Cross multiply
    328,309.30x = 492,099.45 × 128,563.30
  4. Step 4: Simplify right side
    328,309.30x = 63,265,929,220.19
  5. Step 5: Solve for x
    x = 63,265,929,220.19/328,309.30
  6. Step 6: Final answer
    x = 192,702.21

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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.