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Finding the Fourth Proportional to 219,756.40, 329,615.40 and 72,012.40

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Solution

The fourth proportional to 219,756.40, 329,615.40 and 72,012.40 is: 108,012.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,756.40 : 329,615.40 = 72,012.40 : x
  2. Step 2: Convert to fraction form
    219,756.40/329,615.40 = 72,012.40/x
  3. Step 3: Cross multiply
    219,756.40x = 329,615.40 × 72,012.40
  4. Step 4: Simplify right side
    219,756.40x = 23,736,396,030.96
  5. Step 5: Solve for x
    x = 23,736,396,030.96/219,756.40
  6. Step 6: Final answer
    x = 108,012.31

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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.