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Finding the Fourth Proportional to 328,539.70, 492,862.74 and 128,751.76

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Solution

The fourth proportional to 328,539.70, 492,862.74 and 128,751.76 is: 193,148.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,539.70 : 492,862.74 = 128,751.76 : x
  2. Step 2: Convert to fraction form
    328,539.70/492,862.74 = 128,751.76/x
  3. Step 3: Cross multiply
    328,539.70x = 492,862.74 × 128,751.76
  4. Step 4: Simplify right side
    328,539.70x = 63,456,945,213.42
  5. Step 5: Solve for x
    x = 63,456,945,213.42/328,539.70
  6. Step 6: Final answer
    x = 193,148.48

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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.