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Finding the Fourth Proportional to 328,726.70, 493,104.11 and 129,090.28

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Solution

The fourth proportional to 328,726.70, 493,104.11 and 129,090.28 is: 193,640.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,726.70 : 493,104.11 = 129,090.28 : x
  2. Step 2: Convert to fraction form
    328,726.70/493,104.11 = 129,090.28/x
  3. Step 3: Cross multiply
    328,726.70x = 493,104.11 × 129,090.28
  4. Step 4: Simplify right side
    328,726.70x = 63,654,946,719.02
  5. Step 5: Solve for x
    x = 63,654,946,719.02/328,726.70
  6. Step 6: Final answer
    x = 193,640.94

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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.