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Finding the Fourth Proportional to 219,356.80, 329,035.20 and 79,129.60

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Solution

The fourth proportional to 219,356.80, 329,035.20 and 79,129.60 is: 118,694.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,356.80 : 329,035.20 = 79,129.60 : x
  2. Step 2: Convert to fraction form
    219,356.80/329,035.20 = 79,129.60/x
  3. Step 3: Cross multiply
    219,356.80x = 329,035.20 × 79,129.60
  4. Step 4: Simplify right side
    219,356.80x = 26,036,423,761.92
  5. Step 5: Solve for x
    x = 26,036,423,761.92/219,356.80
  6. Step 6: Final answer
    x = 118,694.40

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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.