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Finding the Fourth Proportional to 343,905.70, 515,931.45 and 103,999.90

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Solution

The fourth proportional to 343,905.70, 515,931.45 and 103,999.90 is: 156,021.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    343,905.70 : 515,931.45 = 103,999.90 : x
  2. Step 2: Convert to fraction form
    343,905.70/515,931.45 = 103,999.90/x
  3. Step 3: Cross multiply
    343,905.70x = 515,931.45 × 103,999.90
  4. Step 4: Simplify right side
    343,905.70x = 53,656,819,206.86
  5. Step 5: Solve for x
    x = 53,656,819,206.86/343,905.70
  6. Step 6: Final answer
    x = 156,021.90

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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.