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Finding the Fourth Proportional to 339,778.32, 509,686.92 and 103,128.72

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Solution

The fourth proportional to 339,778.32, 509,686.92 and 103,128.72 is: 154,698.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,778.32 : 509,686.92 = 103,128.72 : x
  2. Step 2: Convert to fraction form
    339,778.32/509,686.92 = 103,128.72/x
  3. Step 3: Cross multiply
    339,778.32x = 509,686.92 × 103,128.72
  4. Step 4: Simplify right side
    339,778.32x = 52,563,359,660.34
  5. Step 5: Solve for x
    x = 52,563,359,660.34/339,778.32
  6. Step 6: Final answer
    x = 154,698.98

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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.