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Finding the Fourth Proportional to 289,749.80, 434,624.70 and 102,780.20

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Solution

The fourth proportional to 289,749.80, 434,624.70 and 102,780.20 is: 154,170.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,749.80 : 434,624.70 = 102,780.20 : x
  2. Step 2: Convert to fraction form
    289,749.80/434,624.70 = 102,780.20/x
  3. Step 3: Cross multiply
    289,749.80x = 434,624.70 × 102,780.20
  4. Step 4: Simplify right side
    289,749.80x = 44,670,813,590.94
  5. Step 5: Solve for x
    x = 44,670,813,590.94/289,749.80
  6. Step 6: Final answer
    x = 154,170.30

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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.