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Finding the Fourth Proportional to 219,920.90, 329,816.55 and 86,756.90

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Solution

The fourth proportional to 219,920.90, 329,816.55 and 86,756.90 is: 130,109.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,920.90 : 329,816.55 = 86,756.90 : x
  2. Step 2: Convert to fraction form
    219,920.90/329,816.55 = 86,756.90/x
  3. Step 3: Cross multiply
    219,920.90x = 329,816.55 × 86,756.90
  4. Step 4: Simplify right side
    219,920.90x = 28,613,861,446.70
  5. Step 5: Solve for x
    x = 28,613,861,446.70/219,920.90
  6. Step 6: Final answer
    x = 130,109.79

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1.5x scale

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.