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Finding the Fourth Proportional to 539,301.78, 808,965.18 and 139,958.28

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Solution

The fourth proportional to 539,301.78, 808,965.18 and 139,958.28 is: 209,940.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    539,301.78 : 808,965.18 = 139,958.28 : x
  2. Step 2: Convert to fraction form
    539,301.78/808,965.18 = 139,958.28/x
  3. Step 3: Cross multiply
    539,301.78x = 808,965.18 × 139,958.28
  4. Step 4: Simplify right side
    539,301.78x = 113,221,375,172.69
  5. Step 5: Solve for x
    x = 113,221,375,172.69/539,301.78
  6. Step 6: Final answer
    x = 209,940.67

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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.