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Finding the Fourth Proportional to 219,839.81, 329,535.54 and 86,646.11

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Solution

The fourth proportional to 219,839.81, 329,535.54 and 86,646.11 is: 129,880.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,839.81 : 329,535.54 = 86,646.11 : x
  2. Step 2: Convert to fraction form
    219,839.81/329,535.54 = 86,646.11/x
  3. Step 3: Cross multiply
    219,839.81x = 329,535.54 × 86,646.11
  4. Step 4: Simplify right side
    219,839.81x = 28,552,971,000.07
  5. Step 5: Solve for x
    x = 28,552,971,000.07/219,839.81
  6. Step 6: Final answer
    x = 129,880.81

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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.