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Finding the Fourth Proportional to 219,780.70, 329,780.40 and 86,665.30

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Solution

The fourth proportional to 219,780.70, 329,780.40 and 86,665.30 is: 130,041.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,780.70 : 329,780.40 = 86,665.30 : x
  2. Step 2: Convert to fraction form
    219,780.70/329,780.40 = 86,665.30/x
  3. Step 3: Cross multiply
    219,780.70x = 329,780.40 × 86,665.30
  4. Step 4: Simplify right side
    219,780.70x = 28,580,517,300.12
  5. Step 5: Solve for x
    x = 28,580,517,300.12/219,780.70
  6. Step 6: Final answer
    x = 130,041.07

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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.