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Finding the Fourth Proportional to 219,720.40, 329,515.80 and 86,556.40

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Solution

The fourth proportional to 219,720.40, 329,515.80 and 86,556.40 is: 129,809.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,720.40 : 329,515.80 = 86,556.40 : x
  2. Step 2: Convert to fraction form
    219,720.40/329,515.80 = 86,556.40/x
  3. Step 3: Cross multiply
    219,720.40x = 329,515.80 × 86,556.40
  4. Step 4: Simplify right side
    219,720.40x = 28,521,701,391.12
  5. Step 5: Solve for x
    x = 28,521,701,391.12/219,720.40
  6. Step 6: Final answer
    x = 129,809.07

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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.