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Finding the Fourth Proportional to 219,718.40, 329,512.80 and 86,554.40

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Solution

The fourth proportional to 219,718.40, 329,512.80 and 86,554.40 is: 129,806.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,718.40 : 329,512.80 = 86,554.40 : x
  2. Step 2: Convert to fraction form
    219,718.40/329,512.80 = 86,554.40/x
  3. Step 3: Cross multiply
    219,718.40x = 329,512.80 × 86,554.40
  4. Step 4: Simplify right side
    219,718.40x = 28,520,782,696.32
  5. Step 5: Solve for x
    x = 28,520,782,696.32/219,718.40
  6. Step 6: Final answer
    x = 129,806.07

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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.