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Finding the Fourth Proportional to 338,789.76, 508,239.90 and 139,056.54

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Solution

The fourth proportional to 338,789.76, 508,239.90 and 139,056.54 is: 208,607.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,789.76 : 508,239.90 = 139,056.54 : x
  2. Step 2: Convert to fraction form
    338,789.76/508,239.90 = 139,056.54/x
  3. Step 3: Cross multiply
    338,789.76x = 508,239.90 × 139,056.54
  4. Step 4: Simplify right side
    338,789.76x = 70,674,081,983.95
  5. Step 5: Solve for x
    x = 70,674,081,983.95/338,789.76
  6. Step 6: Final answer
    x = 208,607.49

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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.