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Finding the Fourth Proportional to 338,765.90, 508,063.79 and 139,141.40

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Solution

The fourth proportional to 338,765.90, 508,063.79 and 139,141.40 is: 208,677.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,765.90 : 508,063.79 = 139,141.40 : x
  2. Step 2: Convert to fraction form
    338,765.90/508,063.79 = 139,141.40/x
  3. Step 3: Cross multiply
    338,765.90x = 508,063.79 × 139,141.40
  4. Step 4: Simplify right side
    338,765.90x = 70,692,707,029.91
  5. Step 5: Solve for x
    x = 70,692,707,029.91/338,765.90
  6. Step 6: Final answer
    x = 208,677.16

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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.