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Finding the Fourth Proportional to 338,859.70, 508,491.15 and 128,518.90

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Solution

The fourth proportional to 338,859.70, 508,491.15 and 128,518.90 is: 192,854.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,859.70 : 508,491.15 = 128,518.90 : x
  2. Step 2: Convert to fraction form
    338,859.70/508,491.15 = 128,518.90/x
  3. Step 3: Cross multiply
    338,859.70x = 508,491.15 × 128,518.90
  4. Step 4: Simplify right side
    338,859.70x = 65,350,723,257.74
  5. Step 5: Solve for x
    x = 65,350,723,257.74/338,859.70
  6. Step 6: Final answer
    x = 192,854.81

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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.