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Finding the Fourth Proportional to 328,539.90, 492,712.65 and 128,745.30

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Solution

The fourth proportional to 328,539.90, 492,712.65 and 128,745.30 is: 193,079.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,539.90 : 492,712.65 = 128,745.30 : x
  2. Step 2: Convert to fraction form
    328,539.90/492,712.65 = 128,745.30/x
  3. Step 3: Cross multiply
    328,539.90x = 492,712.65 × 128,745.30
  4. Step 4: Simplify right side
    328,539.90x = 63,434,437,938.05
  5. Step 5: Solve for x
    x = 63,434,437,938.05/328,539.90
  6. Step 6: Final answer
    x = 193,079.86

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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.